Disclaimer: Maybe I shouldn't be posting a review here since I didn't actually BUY anything, but my experience was top notch (and I was expecting to be disappointed) so it couldn't hurt.
My boyfriend and I came into possession of an ancient X-Cargo car top carrier that is no longer in production and also was missing some crucial parts (and also isn't REI brand to begin with). We went in as an absolute last resort to find this part, lest we have to travel all the way to the wilds of Concord to find it. (The HORROR!)
An employee took a look at our part, brought out the same parts of the other car top carriers they have, pre-bent, and took it right in back to bend it at the same angle as ours with his vice grip, FREE OF CHARGE. It worked perfectly for our needs, which ended up saving us a ton of room AND money (because we can now fit a bed in the back of our car, which space would have otherwise been occupied by the things that are now snug as a bug in a car top carrier. So no hotels!)
Thanks, dude! I feel really bad that I never got his name, but he is a lifesaver.