I acquired the basic chassis and and drive chain of a small motorized unit and set-out to bring it back to life. I picked-up a Rio Grand 53 shell, but it needed front and rear end rails. These reproductions I bought are good. They fit a little in the snug side, but I got them on, and once on that's it. Everything is good to go. These end rails did the job they are intended to do. I recommend them.