Tried to install these http://www.minimania...zel-Roller-Type U joints today to replace my stock rubber ones that are hitting the exhaust manifold, and after an hour of cursing not being able to fit them, I noticed the reason for my trouble was that the grooves in the nylon cups are considerably wider (cut further to the ends) than the bolt holes on the driveshafts. Needless to say this makes it damn near impossible to line up the U bolts. Even when I managed to get 2 U bolts through, they were putting so much undue stress on the inside of the nylon cup that It started to crack it! Any else had issues with these?