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Replaces the mounting hardware for your Searsbox cargo box (SP-20SV).
Features:
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Ellen: Hey everybody. Ellen here at eTrailer.com. 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:
96% were satisfied with this product
4% of customers were not satisfied
Ratings & Reviews
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 etrailer.com, 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.
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.
Perfect fit for my sportrack vista xl cargo box.
Just what I needed
Was so happy to find etrailer.com! 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!
Product arrived on time, well packaged, as described.
It’s great to be able to order replacement mounting parts for a Cargo top carrier from etrailer.com
I bought a used car top carrier for a fraction of a new one and now it’s complete with mounting hardware.
Thanks etrailer.com
Jeffrey
6/10/2020
Excellent hardware kit. Just what was needed
Exactly as ordered
They fit perfect. I was having a hard time finding pieces for the cargo box. Thanks so much
A little pricey, but a great product. Better than the original hardware IMO. Worked for an old Yakima Spacebooster cargo box I got for cheap.
Thanks for keeping hardware for old products in stock. I saved alot because we didnt have to buy a new cargo box.
Maineah
6/2/2025
Very well, went through 4 vehicles Jeeps and now a Subaru since I bought my x cargo bix from sears. Lost the origional hardware when I moved but this kit brought it back to life.
I don't like the material, it looks so weak hope it doesn't break on me with heavy wind going at 70 mph.
Good product- complete kit but I would suggest you also provide a set of locking nuts in addition to the hand twist pins. They are bulky and can get in the way of the cargo.
This is the only place that I was able to find replacement hardware for the apparently very old Sears Sport 20-SV cargo box that I purchased recently. I used it recently on a trip and it worked great. It was a lot to pay for such basic hardware, but considering I only paid $30 for the cargo box, I still felt like it was worth it to make sure I had the proper hardware instead of the inferior solution that I had planned.
The delivery took longer than I expected. I am satisfied with the equipment sent to me .
This kit was exactly what I needed to fit an older Yakima Rocketbox that was designed for 4inch on center u-bolts. The quality of the parts is great. Will be mounting the box for a trip for the first time next week.
Etrailer had the part I needed that I couldn't find anywhere else in the US and it was shipped that day. Thank you!
Worked well for our XL Cargo box, some Ubolts had be pushed in a little to make it through the precut holes on our cargo box. Love how fast it shipped and came right before our trip.
Good product although one of the holding brackets was bent and misaligned with the plate hole. I had to straighten it in a bench vice.
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.
10/8/2018
Still great! Works well and no corrosion/deterioration.
Fits perfectly. No problems,just like the original hardware. Highly recommend
Fit my Thule sidekick wonderfully! I was nervous since it didn't say if it fit this box as well, but it did.
One year later and everything is still functioning perfectly. Haven't had any problems. The hardware fit and assembled perfectly. I'm very happy to have found etrailer and would shop there again. I recommend this company and their services. Thank you!
i couldn’t find the pieces to our rooftop cargo carrier so i ordered from Etrailer and my parts arrived in 2 days. they were a perfect fit and installation was a breeze. they have great customer service. assistance and attention to detail no matter how small my order was!
i highly recommend etrailer
Best customer service I've ever had buying from an online retailer!
Without a doubt I will recommend etrailer.com to my friends & family and shop here again when I need something!
Cameron
7/7/2026
Flawlessly! Since my original purchase from etrailer.com, I’ve used my cargo box carrier multiple times and am plan on using it again this week on a family road trip. Thank you so much etrailer.com!
Condition: Missing Parts
Notes: Item is missing 3 of the knobs which can be purchased from the site - Item TH04877.
Info for this part was:
At etrailer 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.
Virginia
6/21/2021
Things are still working good, a year later, everything is functioning as at should.