Yeah, what CJK440 said-any O.E. Ford Tremec probably has a 10-spline input. On clutches: typical GM use diaphragm pressure plate and Mopars used Borg & Beck pressure plates. Both B&B and diaphragm pressure plates are available in 10.5 and 11 and use identical bolt patterns. So if your clutch parts are in good condition you just need to put a new disc in. Same is true if you need a Ford 10-spline disc-just get the same size as the disc you are replacing.