Thanks for the info on poverty cap diameters. The caps that came on mmy Dart were on the13 inch wheels and look small to me, but I've been looking at the poverty caps on my Ford wheels. I'm going to try my poverty caps on the ford wheels. Not optimistic. I have many Chevy poverty caps that measure the same as the Mercury caps I now have on the Dart and those Chevy caps were a bugger to put on the Ford wheels and very difficult to remove--really tight. I'm installing tubular upper control arms right now and it's a good opportunity to test fit on the table top. This control arm install is taking days since I need many rest periods. I'm 77 and not quitting cars yet, just slow.