1. Accessories and Parts
  2. Car Top Cargo
  3. Roof Box
  4. Mounting Kit
Replacement Mounting Hardware for Car Top Cargo Roof Cargo Box

Replacement Mounting Hardware for Car Top Cargo Roof Cargo Box

lowest price pledge
Our Price: $41.94
Accessories and Parts
Orders above $99 qualify for Free Shipping
Shipping Weight: 1.08 lbs
Quantity: 
CTC-18PARTS - Mounting Kit Car Top Cargo Roof Box
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

Customer Photos

This kit replaces the mounting hardware for your Car Top Cargo roof cargo box. Includes 4 U-bolts, 4 spacers, and 8 knobs. Call 800-298-8924 to order Car Top Cargo accessories and parts part number CTC-18PARTS or order online at etrailer.com. Free expert support on all Car Top Cargo products. Guaranteed Lowest Price and Fastest Shipping for Replacement Mounting Hardware for Car Top Cargo Roof Cargo Box. Accessories and Parts reviews from real customers.
  • All Info
  • Reviews (45)
  • Q & A (24)
  • Videos (1)
  • Photos
  • Why etrailer?

Car Top Cargo Accessories and Parts

  • Roof Box
  • Mounting Kit
  • Car Top Cargo

This kit replaces the mounting hardware for your Car Top Cargo roof cargo box. Includes 4 U-bolts, 4 spacers, and 8 knobs.


Features:

  • Replaces the mounting hardware for Car Top Cargo roof cargo boxes
    • Fits model CTC-18S
  • Includes 4 U-bolts, 4 plates, and 8 hand knobs


CTC-18PARTS Replacement Mounting Hardware for Car Top Cargo Roof Cargo Box

Item # CTC-18PARTS





Video of Replacement Mounting Hardware for Car Top Cargo Roof Cargo Box

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.




Video Transcript for Review of Car Top Cargo Roof Box Parts - Mounting Hardware - CTC-18PARTS

Ellen: Hey everyone. I'm Ellen here at etrailer.com. Today, we're taking a look at the replacement mounting hardware for Car Top Cargo Roof Cargo Box.This is going to be that attachment hardware to get your roof cargo box secured to your roof rack on your vehicle. This can also work with several different older style roof cargo boxes out there, so I'm going to go over the measurements here to make sure that this is going to be a fit for your application.Basically, what comes in our kit, we'll get our four straps, or our four just flat brackets and then four of these . almost like a parentheses brackets shaped bracket. It's got that little notch there.

It'll work with several different bar styles, if it's round, square, elliptical, or anything else. And then we'll get our eight wing knobs or wing nuts to tighten those down. There are also four clips that come with it, just little spring safety clips.As far as the measurements go for our plates, the overall length for each of these is 5", going from that rounded end to rounded end. The distance between the mounting holes center to center is 4". The width is right at 1" and the thickness is about 1/8".

The diameter of those holes for each of our brackets is about 5/8", or excuse me, 5/16", maybe just under, or just about 1/4", which matches up, of course, with our U-bolts. The outside distance for each of these is going to be 4-1/4", so from outside edge to outside edge. The distance between these center to center, though, is going to be 4", which again matches up with our plate there. The diameter of those U-bolts is about 1/4". The length here on the side is about 1-3/4".

The overall height or depth, however you want to look at it, is about 2-1/2", going from the end of that little notch to the end of the threads. And then our wing knobs are about 1" tall and about 1-1/4" or 1-1/2" at the longest point.Now, this fits the Car Top model CTC-18S, but again, it does fit several other cargo boxes out there so it can be used for other applications. You just want to be sure that whenever you're tightening these, this hardware down on your roof, that you kind of go back and forth to make sure that everything's pulled down appropriately. You want to make sure that you kind of alternate each, from one to either side, so that you're not tightening one side more than the other.But that's basically going to do it for our look at the replacement mounting hardware for Car Top Cargo Roof Cargo Box.


Customer Reviews

Replacement Mounting Hardware for Car Top Cargo Roof Cargo Box - CTC-18PARTS

Average Customer Rating:  4.8 out of 5 stars   (45 Customer Reviews)

This kit replaces the mounting hardware for your Car Top Cargo roof cargo box. Includes 4 U-bolts, 4 spacers, and 8 knobs.

- CTC-18PARTS
by:

Great universal brackets for my Thule car topper! Thanks 693013



- CTC-18PARTS
by:

Bought these for an older sears sv20 cargo topper. They fit the holes on the topper just fine. 646485


Comments
Works very well for our Sears SV20 topper
Tristan J - 05/25/2020

77578

- CTC-18PARTS
by:

Awesome product. Thank you for such fast service. 592393



- CTC-18PARTS
by:

I needed to attach a luggage carrier to the top of my vehicle more securely than just straps around it. After measuring the holes in the car top carrier I ordered this attachment. The pkg arrived on time and was reasonably priced for the strength it provided. While the “u” bracket wasn’t shaped like the rails (rails are flat rather that pointed), the bracket still fit on my 2013 Ford Edge rails. Car top carrier was secure. No whistling and other noise that the straps would have made was heard. I am a female, age 75. I will order from etrailer again. 672439



- CTC-18PARTS
by:

Works great 882956



- CTC-18PARTS
by:

While I haven’t used the parts I ordered yet, I’m glad etrailer had parts available for me to be able to use an old Yakima Rocket Box. 882677



- CTC-18PARTS
by:

Worked well but just some basic instructions would have been helpful. Not super apparent how they go together and have no idea what the small clips were for. 867075



- CTC-18PARTS
by: 08/05/2020

856503



- CTC-18PARTS
by:

Product was as advertised...worked well. Package was shipped promptly and tracking information provided. 854319



- CTC-18PARTS
by:

Quick shipment. Perfect fit for my Thule Evolution Metallic 6410 Car Top Carrier. Looking forward to using it for my drive to the beach with the family. 853476



- CTC-18PARTS
by:

works! 852641



- CTC-18PARTS
by:

The video walkthru of this product was excellent. Product was an exact fit. 851681



- CTC-18PARTS
by:

Good quality. Way cheaper than Thule ha rdware 851043



- CTC-18PARTS
by:

Worked PERFECTLY for older off brand roof carrier. I bought a Reese Carry Power (still sold on Amazon and at Walmart) carrier at a second hand store for pennies. It came with no hardware. etrailer had a video that provided the specs and measurements for their hardware and it was close enough. Installed in less than 10 minutes and it is rock solid. Drove it around town for a couple of days in preparation for eight hour vacation drive and am 100% confident. Order was filled and shipped the next day and arrived in two days. Received email notices when order placed, filled and shipped. Highest satisfaction and rating available. Quality company and quality product. 845762



- CTC-18PARTS
by:

I had received an 18 cu ft hardshell rooftop carrier free but it had no hardware to attach it to the rails of my car. This kit contained everything needed for attachment and it fit perfectly. Enough stuff can be loaded in this that now we are able to see out of the back window of the SUV, handy with traveling yearly to and from Florida and Massachusetts, and the hardware kit holds it safely. 845077



- CTC-18PARTS
by:

These work really well...only wish they came with a rubber-coating on the parts that grip the rails on top of the car. Other than that it's a good product...stays in place without the bolts loosening at all. 824710



- CTC-18PARTS
by:

Quick service. Great. Now I can put my roof box back on the car with the proper parts. 818903



- CTC-18PARTS
by:

I’ll try to keep this one short. It has worked great for me. Secures my cargo box to my rails quickly and it’s also quick to remove. So much peace of mind compared to the old straps that the box had. 799493



- CTC-18PARTS
by:

Ordered this kit to attach an old X-Cargo carrier to the top of my Mazda CX-5. The kit worked perfectly for this application, and I was so happy that I didn't have to hunt for U-bolts and nuts from a hardware store. Two thumbs up! 704525



- CTC-18PARTS
by:

This kit worked great for my Sears X Cargo carrier for the 1992-2000 series. I also purchased the replacement keys which also was a perfect match for the cargo box. I purchased the factory made crossbars to mount this cargo box. 682793



- CTC-18PARTS
by:

We needed new hardware for our XCargo car-top carrier to take our daughter's stuff back to college later this month. Etrailer.com delivered the right parts in time. And etrailer's customer service was excellent. We're very pleased. 679158



- CTC-18PARTS
by:

Fast shipping 673214



- CTC-18PARTS
by:

Soooo, we forgot we had our car-top carrier on when parking in a garage in Ybor City, FL. We stopped, pulled it off and in the process, lost a few pieces. When I Googled replacement parts, etrailer was one of the first to come up and they had exactly what we needed at a great price! Easy ordering, and quick delivery (I paid extra for 3 day shipping). No issues, very east website to navigate, will definitely use them again for anything we might need regarding our 28’ travel trailer! Thanks! 671637



- CTC-18PARTS
by:

Fast service,shipping and great prices 669928



- CTC-18PARTS
by:

Great ! Worked out just great !’ Reasonable price! Fast delivery! Very happy! Thanks!!!! 669125


26
47
Show More Reviews

Ask the Experts about this Car Top Cargo Accessories and Parts

  • Center to Center Spacing of the Car Top Kit U-Bolt for Older Yakima Cargo Box
    The U-Bolts that come in the Car Top Kit # CTC-18PARTS and the Rhino-Rack Kit # S280 measure 4" apart on center. It is possible to use a mounting kit like this on an older Yakima box if there isn't anything else available although you may need to drill new holes and seal the old ones with something like part # LT37467. There may be a replacement mounting kit from Yakima depending on what you have. If you can let me know the name of your Yakima cargo box and/or send me a picture of...
    view full answer...
  • Replacement Mounting Hardware for a Sears Sport 20-SV Cargo Box
    They do not make any specific replacement parts for the Sears Sport 20-SV anymore however, you can certainly make the Replacement Mounting Hardware part # CTC-18PARTS work for you. The holes may not align perfectly but you can always drill new ones and use part # LT37467 to cover the old ones. This is a very popular option for the older Sears cargo boxes like what you have.
    view full answer...
  • Need Replacement Hardware for Thule Evolution Cargo Box
    We do have replacement hardware for the Thule Evolution 1200 cargo box, but # CTC-18PARTS is not the correct part. The actual replacement hardware kit for the Thule Evolution 1200 is the Thule EasySnap Mounting Kit # TH05820 .
    view full answer...
  • Dimensions of U-Bolts in Replacement Mounting Hardware Kit for Car Top Cargo Roof Boxes CTC-18PARTS
    The Replacement Mounting Hardware Kit for Car Top Cargo Roof Cargo Boxes, part # CTC-18PARTS, includes u-bolts that measure 3-3/4-inches inside width and 2-1/2-inches depth measured at the center detent. These and other dimensions are shown on the picture I made for you after I measured the u-bolt. The threaded portion of the ends measures 1-1/4-inches.
    view full answer...
  • New Hardware for Cargo Box That Does Not Fit Current Crossbars
    It would be great if we had a way to guarantee you can essentially elongate your Thule Alpine rooftop box but there is no replacement hardware which is designed for that purpose and I would not be able to confirm hardware that can. If you are willing to drill new holes at whichever points will allow you to mount the box I recommend going with simple U-bolts, the Replacement Mounting Hardware for Car Top Cargo Roof Cargo Box # CTC-18PARTS which is just U-bolts, plates and hand knobs. You...
    view full answer...
  • What Are Dimensions of U-bolts of Replacement Mounting Hardware # CTC-18PARTS
    I attached a picture that has the dimensions of the u-bolts that come with the # CTC-18PARTS. The inner width is 3-3/4 inches. We have the Thule # TH09243 which is 4 inches wide and 2 inches deep.
    view full answer...
  • U-Bolt Dimensions for Replacement Mounting Hardware for Car Top Cargo Roof Cargo Box
    Yes, the U-Bolts that come with the Replacement Mounting Hardware for Car Top Cargo Roof Cargo Box # CTC-18PARTS have a 3/16" diameter and are spaced 4" apart on center. I have attached some photos to demonstrate this and some other measurements that you may be interested in.
    view full answer...
  • Mounting Hardware Kit for Sears X Cargo Roof Mounted Cargo Box
    I am not aware of any direct fit mounting hardware kits available for the Sears X Cargo Roof Mounted Cargo Boxes due to their age. As you mentioned, you will need to drill holes in order to mount it onto a set of crossbars. The u-bolts kits are universal, not model specific. I recommend the Mounting Hardware for Car Top Cargo Roof Cargo Box part # CTC-18PARTS if you have aero crossbars.
    view full answer...
  • Replacement Mounting Hardware for Thule Sidekick Cargo Box
    We have what you need, but the part # CTC-18PARTS is not it. You instead would want the part # TH02943 for U-bolts, part # TH03918 for brackets, and then # TH04877 for replacement wing nut.
    view full answer...
  • Yakima Loadwarrior Basket Replacement Hardware
    We do have replacement mounting hardware for the Yakima LoadWarrior part # Y07070 with the part number # Y8870040 but the # CTC-18PARTS will not work with the Yakima cargo basket.
    view full answer...
  • Replacement Plastic Knob for Cargo Carrier Mounting U-Bolt
    The hand knob found in the Replacement Mounting Hardware for Car Top Cargo Roof Cargo Box # CTC-18PARTS are not available individually. We do have the Replacement Wingnut for Thule Cargo Boxes # TH04877 if your u-bolts are M6 bolts they will fit. You can get a washer and nut or wingnut to fit your u-bolts at a local hardware store, but the plastic portion won't be found there.
    view full answer...
  • Alternate Mounting Hardware for Karrite Rooftop Cargo Box
    Thule made the Karrite cargo boxes for Sears and since the original Thule mounting parts are no longer available you can use a similar u-bolt kit # CTC-18PARTS from Car Top Cargo. You might need to drill a few new holes in the box to fit the alternate hardware; any extra holes can be sealed up using RTV High-Performance Silicone Gasket Maker # LT37467. A handy item to use with a rooftop cargo box is the lightweight folding step # CAM43672 from Camco.
    view full answer...
  • How To Use Karrite Voyager Cargo Box On Thule AeroBlade Crossbars
    The best option we can offer to help you reuse an old Karrite Voyager Cargo Box would be a new set of u-bolts which would require drilling a few holes, the Replacement Mounting Hardware for Roof Cargo Box part # CTC-18PARTS is what most people use. Unfortunately, most cargo boxes don't mount using t-bolts so I do not recommend this.
    view full answer...
  • Will the Replacement Mounting Hardware for Car Top Fit a Packsport Series 90 Cargo Box
    I am not familiar with the Packsport Series 90 Cargo Box but the Replacement Mounting Hardware for Car Top Cargo Roof Cargo Box part # CTC-18PARTS will work with pretty much any cargo box. The u-bolts are 4" wide but if your bolt holes do not match this then you can just drill a few new holes as this is very commonly done on rooftop cargo boxes.
    view full answer...
  • Replacement Mounting Hardware for Sears Sport SP-20SV Rooftop Cargo Box
    We have replacement mounting hardware for a Sears Sport SP-20SV cargo box, but the Replacement Mounting Hardware for Car Top Cargo Roof Cargo Box # CTC-18PARTS is only a fit for the Trunx Rooftop Cargo Box # TRX34FR. The correct mounting hardware for the SP-20SV is the Replacement Hardware Kit for Searsbox Cargo Box # TH05603. We don't carry that cargo box, and we would be unable to confirm any specific fits, but I believe it is a universal fit so there's no reason to think it won't...
    view full answer...
  • U-Bolt Replacements for Roof Mounted Cargo Box Ski Rack
    The inch equivalent for the metric measurements you gave are 3.54331 inches by 3.14961and 0.23622 inches diameter and unfortunately we don't have those specific measurements. We have the Thule # TH09243 which is 4 inches wide and 2 inches deep. We also have the Car Top Cargo # CTC-18PARTS which is about 4 inches wide and 1-5/8 to 2-1/2 inches deep. I've attached photos to assist. If you have a cargo box, you may need to drill new holes and use RTV gasket maker # LT37467 to seal...
    view full answer...
  • Alternate Mounting Hardware for Yakima SpaceBooster Cargo Box on 2015 Subaru Outback Wagon
    It is not a huge deal to add a few new mounting holes to the bottom of an ABS plastic cargo box like the Yakima SpaceBooster. A cordless drill and appropriately-sized drill bit will make short work of it. I would avoid using a heated implement for making the holes since it could be a bit messy and could make it harder to control the size of the hole. The things to keep in mind are that you want to drill no more additional holes than absolutely necessary so measure, check and re-check....
    view full answer...
  • Will the Replacement Mounting Hardware for the New Yakima SkyBox Work With the Old SkyBox
    The Replacement Mounting Hardware for Yakima SpaceCase, SpaceCadet, and RocketBox part Y8770018 is for the older generation cargo boxes whereas the Replacement Mounting Hardware for Yakima SkyBox and Rocketbox part # Y90135 is for the new generation cargo boxes. Unfortunately, the new generation cargo boxes use a unique mounting channel so the two clamps are not cross-compatible. If you have the older generation cargo box then you will need a new mounting clamp system as the old set...
    view full answer...
  • Upgraded U-Bolt Mounting Hardware Recommendation for Older Thule Excursion Cargo Box
    I spoke with my contact at Thule just to be sure we could recommend the correct hardware for your Excursion cargo box. He said that the original replacement hardware is the Replacement Quick Mount Hardware Kit, # TH04997. If you want U-bolts, the Replacement Mounting Hardware for Car Top Cargo Roof Cargo Box # CTC-18PARTS will give you the same 4 inch centers needed.
    view full answer...
  • Mounting Hardware for Karrite Voyager Cargo Box
    Glad we could help you find the locks for your Karrite Voyager rooftop cago carrier. And while we do not carry direct replacement mounting hardware for this box there is still a solution for you. What you can do is use hardware kit # CTC-18PARTS; this will require you to modify the box and drill holes so use Sealant # LT37467 to cover those holes up.
    view full answer...
  • Mounting Hardware for 2002 Yakima Rocketbox Cargo Box for Installation on 2014 GMC Yukon
    You can still get the box up on your Yukon but you'll have to do a little bit of customizing in order to adapt an alternative install kit. I checked with my contact at Yakima about hardware options for mounting your 2002 Rocketbox on your 2014 Yukon. Unfortunately in the case of your 2002 Rocketbox Yakima is completely out of their hardware kits. Since the box is now out of warranty you lose no warranty coverage by modifying it slightly. A cost-effective option is to use replacement...
    view full answer...
  • Recommended Thule Roof Rack for 2017 Audi Q7 and Mercedes OEM Cargo Container Mounting Hardware
    The Mercedes-Benz rooftop cargo boxes were made by Thule so they will absolutely fit the Thule Aero crossbars as you mentioned. For your 2017 Audi Q7 I recommend the 53 inch bars # TH711420 with the foot pack # TH460R and then fit kit # THKIT3145 confirmed to fit your vehicle. The cargo box used t-slot mounting which is not available from Thule as it was a precise fit for the dimensions of your previous rack and it will most likely not be a precision fit to the fixed mounting locations...
    view full answer...
  • 2872 Key and Mounting Hook for a Karrite Voyager Rooftop Carrier
    The Karrite Voyager is no longer in circulation, but we do have some parts that can work with it. Since Thule made these cargo boxes, you can use their replacement key for the 2872 lock, part # THKEYN2872. They also made a similar u-bolt for mounting that you can use on your carrier. It's part # CTC-18PARTS. It may require some additional drilling on your part.
    view full answer...
  • Availability of Replacement Mounting Hardware for Thule Cascade Roof Mounted Cargo Box
    The Thule Cascade boxes use hardware kit # TH04997. There is not a replacement for this from Thule but you could use the # CTC-18PARTS if you prefer u-bolts.
    view full answer...

Do you have a question about this Accessories and Part?




  • Why etrailer.com?

    At etrailer.com we guarantee:
  • Highest quality accessories and parts for the best price.

    Our Lowest Price Pledge ensures you will never overpay for the parts you need.
  • Real product know-how.

    We make sure that the products we sell are what we say they are, and that they work the way they are supposed to work. Get real advice from a real person who has the knowledge and expertise needed to solve your problem.
  • Most detailed, accurate accessories and part information available.

    Because we take providing accurate product information seriously, we take our own detailed product photos, demo videos and installation videos, as well as verify measurements, instructions, and vehicle fit information.
  • Installations, made easy.

    We love helping people and have the most highly-trained customer service, hands-on experience, step by step videos and installation instructions.
  • Fast shipping.

    Your order is automatically routed to get out of our warehouse and to your door as quickly as possible. Receive free shipping on orders over $99.
  • Personalized service for life.

    We provide one-on-one, personalized service from the ordering process through the life of your product.
  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
  • Returns Policy

    Need to return an item? No problem. Please read our Returns Policy for more information.

Info for this part was:

Edited by:
Tyler C
Expert Research:
Jameson C
Expert Research:
Adam R
Installed by:
Kathleen M
Written by:
Daron K

At etrailer.com we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.