Depending on what size clutch you are using, you can use these clutch discs with your original pressure plate.
11"------ 1973 - 1982 Corvette
10 1/2"-- 1972 Corvette 4 speed
9 1/8" -- S10 with a 2.2

All of these are 26 spline with a 1 1/8" dia input shaft

Ontario Inliners
1965 Chevelle
1940 Chev
1965 Chev Pick-up
1970 MGB Roadster