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Replacement Hardware Kit for Searsbox Cargo Box

Replacement Hardware Kit for Searsbox Cargo Box

Item # TH05603
Our Price: $72.25
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Replaces the mounting hardware for your Searsbox cargo box (SP-20SV). 1-800-940-8924 to order Thule accessories and parts part number TH05603 or order online at Free expert support on all Thule products. Great prices and Fastest Shipping for Replacement Hardware Kit for Searsbox Cargo Box. Accessories and Parts reviews from real customers.
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Thule Accessories and Parts - TH05603

  • Roof Box
  • Mounting Hardware
  • Thule

Replaces the mounting hardware for your Searsbox cargo box (SP-20SV).


  • Replacement hardware for your Searsbox cargo box (SP-20SV)
  • Includes hardware to mount all 4 corners of your cargo box to your roof rack crossbars

05603 Thule Replacement Hardware Kit for Sears Cargo Carrier

Video of Replacement Hardware Kit for Searsbox Cargo Box

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

Video Transcript for Review of Thule Replacement Parts - Roof Box Hardware - TH05603

Ellen: Hey everybody. Ellen here at Today we're going to be taking a look at the replacement hardware kit for the Searsbox cargo box. This is a replacement hardware kit from Thule, and it's going to come with everything you see laid out on the table here.We'll get four of our larger plates. Four of our smaller plates. Four U-bolts with the threaded ends.

And then eight wingnuts. And also, a sheet of vinyl stickers.The vinyl stickers help to plug up any holes for unused mounting holes. So any kind of hole that you have in your cargo box that isn't being used, this can help to seal that up and prevent any leaks from happening. We'll get 15 of those little stickers. I'm going to set these off to the side, because my fan tends to blow them away.

But they do come with your kit.The more important part, though, will be our brackets. So everybody wants to know how big these are. Will they fit my cargo box And like I said, this does fit the Sears Box cargo box. But it does work for a lot of different cargo boxes out there. Especially if it has that style that has the U-bolts and clamps to get it attached.So this bigger plate here measures about 5 1/2" long by about 2 1/2" wide.

The mounting holes, center to center, for the two furthest ones are about four inches apart. Again, that's center to center. And then, the two . each one is separated by about two inches center to center.It is about 1/8" thick. Maybe even less than 1/8".

So it's a pretty thin material, but it is pretty durable. So this might flex around your bar, depending on how tight you get it. That can be a good thing, because then it'll help to kind of grip around and prevent any sliding, but, of course, you don't want to over-tighten, and then end up crushing this, or totally warping it.Our smaller bracket. Let's look at that one. From end to end, it kind of has these rounded edges. It's about five inches long. And about an inch wide. We'll have several mounting holes on this one. The two widest holes are four inches apart again, center to center. The two that are a little bit set in from that, center to center, those are three inches apart. And then from those narrowest holes to that center hole, is about 1 1/2" to our furthest out option is about two inches.So, two inches in between these two holes. 1 1/2" in between these two. And then it'll be the same going in the other direction. Now, those measurements are going to be the same for all of our brackets.Let's look at our U-bolt. So, from outside edge to outside edge, that U-bolt is about four inches wide. The threads are a little bit thicker. They go just past four inches. But I think four inches is going to be . excuse me. 4 1/4 inches. So, the center of the bolt to the center of the other one is a little bit wider than that at the ends, so they do kind of flare out. But at the top it's about four inches.There is a slight curve to that, so it'll work well for aero bars, elliptical bars, round bars. Pretty much most style roof racks. The tallest portion of that is just over two inches from the bottom of the threads to the very top of it. The inside area is about two inches. The threaded portion is a little over an inch. Maybe 1 1/8" long. So I hope that helps you in determining if this is going to fit for your box.Those handle nuts, overall, are about 1 1/2" long. The widest point, that little wing portion, is about 1 3/8". The nut, or the threaded portion inside, does sit back a little bit. Say that starts about where that bump is in the bolt, and that's about 3/8" deep. So I have a little bit of room.And then, it goes down about 7/8". So I just wanted to kind of go over those measurements with you to help figure out if this is going to fit your particular cargo box. This is going to be a very universal kit. A lot of boxes will have that four-inch-wide mounting holes.If yours doesn't but you still need this kit, you still need that clamp style, you can always drill out those holes. Just be careful whenever you do that. Always measure twice, cut once. And plug up any holes that you might have created on accide.tnAnd that's going to do it for our look at the replacement hardware kit for the Searsbox cargo box.

Customer Satisfaction Score:

Customer Reviews

Replacement Hardware Kit for Searsbox Cargo Box - TH05603

Average Customer Rating:  4.9 out of 5 stars   (164 Customer Reviews)

Replaces the mounting hardware for your Searsbox cargo box (SP-20SV).


I couldn't be more pleased with this product, which enabled me to very simply, easily, and inexpensively mount my wonderful 1991 Yakima Rocket box to my 2017 Acura MDX. With your product and by drilling 8 holes, the Rocket Box is securely mounted directly to the MDX. The challenge that your product solved is that the MDX comes with roof rails and crossbars, but the crossbars are fixed mount (don't slide), the existing holes in the box don't match the crossbar spacing, and the Acura crossbars are too wide for the Yakima U bolts. Various dealers tried to sell me expensive sliding tracks to mount to the box, mounts for the round Yakima crossbars to go on top of the Acura crossbars, a makeshift assortment of bolts/nuts/plates, and one even recommended I scrap my perfectly good 1991 Rocket Box and buy a new one. Your product simply and elegantly solved ALL of the problems in the time it took for ordering (great web site), quick delivery, and the 30 minutes it took me to measure and drill 8 holes. The quality of the product is fantastic and I can't thank you enough! Warmest regards and keep up the great work!

Kip L.


Still great! Works well and no corrosion/deterioration.


Exactly what I needed. Fits perfectly with my good old Thule Sears Cargo box.
The shipping was a bit longer than expected but I’m from Canada. Very satisfied.


Thanks for keeping hardware for old products in stock. I saved alot because we didnt have to buy a new cargo box.


thank you so much. Years ago, I bought this 2005 Sears X-cargo rooftop carrier a yardsale and needed new hardware and needed new keys now I've got a rooftop carrier!!


I placed an order and realized I needed it sooner and didn’t want to take a chance of not getting it in time so I called and Christine helped me cancel my order and reorder with rush delivery. They got it to me in 2 days ! This was excellent customer service!


Worked well for the application, as adv ertised.


Very reliable and efficient - very pleased !!


It’s great to be able to order replacement mounting parts for a Cargo top carrier from
I bought a used car top carrier for a fraction of a new one and now it’s complete with mounting hardware.



Excellent hardware kit. Just what was needed


Was so happy to find! We were given a karrite carrier, with no key and no hardware to attach it to the rack, but @ etrailer we got exactly what we needed. And it came in good time to prepare for our vacation! I highly recommend this company! Thank You etrailer!



Things are still working good, a year later, everything is functioning as at should.


I am impressed with the product and the staff. It arrived when I needed it and received multiple follow up from the company. Definitely highly recommended.


I could not use the "U-bar" connectors on my Thule/roof rack because they were not long enough to reach all the way from under the roof rack and into the Thule. I had to improvise with some longer bolts at home. The flat metal pieces are semi-thin and will likely bend if you try to tighten the connection too much, but I expected that since I was getting a good price. The parts that I am using one year after purchase are holding up well.


I was looking for a way to resurrect my first generation Yakima Rocket Box, re-inherited from my son. The first issue was in mounting it to the Air Stream crossbars on the Grand Cherokee. Google lead me to, where I found several options with the most reasonable being the Searsbox (Thule) hardware and an extensive and useful discussion of the options.

My order was processed promptly but delivery was delayed by the Post Office backlog, which also kept delivery information from being provided through USPS tracking. I inquired to etrailer and received very friendly and prompt response. I also received a follow-up email on the delivery date.

Excellent customer service! Excellent source for parts and information.


First, the price for the item is in my opinion very high for what it is. Second, no assembly instructions are supplied. third, when I called yesterday I encountered someone at etrailer that no idea of what went where and told me that the parts should be assembled opposite from how they should be done. I went to [online} and searched for the info and found what I needed. You need to include assembly instructions, and for the price I paid, there certainly was enough money to do this!

Etrailer Expert

Jenny N.


I did research to see if instructions were available however Thule does not provide them for the replacement hardware kit.


These would have worked fine if the Ubolt was 2 to 2 1/2" longer. I have the old Thule cross brace and the brackets of the brace require longer Ubolt threads height. I saved the package for my kids to use with their brackets. Had to use eye-bolt turnbuckle (because it was adjustable to fit the metal plates hole in the package) & 2 1/2" X1/4" carriage bolts. Install with the plates, turned out fine. I should have ordered the quick release package with the longer bolts. Lesson learn. Materials not wasted. Thank you


First, I was amazed that I could find the necessary hardware to attach our Sears xcargo box to our car. Second, I was equally shocked that my order arrived so quickly. Awesome service.



We used this cargo box for a 3000 mile road trip. Everything worked as it was designed. It is the perfect match for our Subaru Outback.


Worked Great, Easy fit and install !


The search comes to an end! Perfect kit to make my 30 year old Yakima cargo box fit on latest Yakima Jetstream rack. Had to drill holes to fit the wider U-bolts which was no problem. Highly recommended! Great support and follow up from etrailer.


The order arrived at the time I was told it would. The parts are identical to the original equipment in every way and the cost was reasonable. Finally, the packaging was such that there was no damage done to the equipment. was all that I could have wanted it to be.

Nicholas L.


They are still working well!


We ordered the replacement hardware kit for Searsbox cargo box. The video of the product at the internet site was helpful, but could have shown how to use the parts in an actual replacement.

The kit arrived as advertised, as promised and on time.

I would highly recommend


Came fast and everything was in great condition! Thank you!!


I bought a Thule used and it did not have a number or name on it. The equipment to attach it did not fit my minivan or toyota highlander so I searched on for the right set. I measured the distance between all the existing holes on the Thule and found this set that matched up. Received it quickly, went directly out to the garage and installed them. I did have to gently tap two of the four with a mallet to get them just a smidge smaller, but they all fit now. Super happy with this purchase! I would recommend to anyone.

Fits both a 2005 Kia Sedona and 2013 Toyota Highlander. Thule is an "Adventurer" of unknown year.


Perfect fit for a used Sears Sport 20 Car Top Carrier that I had bought on F/B Marketplace!
I liked the fact that this online retailer gave measurements on the widths of not of the carriage bolts (U-bolts), but also the brackets! That was and is VERY helpfulfor those who will be looking!..


I just received a hardware mounting kit from etrailer for my Sears X Cargo roof carrier. One of the ubolt mountings that came with the carrier became stripped and would not tighten so I found etrailer on line and bought a new set.
A man named Caleb helped me on the phone and prevented me from ordering the wrong kit that I had picked out on line. It was delivered very quickly and every part was a perfect match.
I would certainly deal with etrailer again in the future.


Actually, I used this kit on a hard sided golf bag carrier to attach it to my roof rack on my 2017 Outback. All I did was drill holes using the flat plates to lay out the holes and used the included hardware to fasten securely. Worked well. Now I carry gear in it when needed.


Everything arrived and worked as advert ised.

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