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I have a Honda Odyssey and designed a 3D printable bracket to hold mounting hardware in place for custom crossbars (or anything that can mount with bolts). It's made from TPU and acts as a small amount of cushion between metal parts while also stabilizing the bolts. There's also a cage for square 20x20mm T nuts that goes into my particular crossbars, an Amazon Basics cheapie set.
Now I want to make versions for different vehicles. I've had a Cherokee and WJ in the past but of course never thought to measure anything.
Please post your vehicle, year or generation, and the rail width and height. I prefer metric but imperial is OK.
A sketch or picturing showing the profile would be great but it's difficult to design something that fits exactly. It took me 6 or 7 tries to get an exact match for my Odyssey. So the universal ones will probably just be a simple rectangular opening for now.
My 4th gen 2014 Honda Odyssey rails are 49mm wide and 30mm high
This is my Makerworld page for the bracket. Currently just has the Odyssey version https://makerworld.com/en/models/3169853-roof-rack-crossbar-adapter-for-4th-gen-odyssey