Junk yard parts should work if you can find some close. Look at the Spal site, it might give you an idea what to look for. If you can, get the motors and stuff from rear doors on four door cars, they are always in better shape from less use. Measure the distance you need to lift and lower and look for same size doner car. Ford used cable drive alot, and our Honda had a small set up in it. The big gear drives from the '70s would be to big, I don't think they would fit in the door. Joe