Actually, 65-70 B-body GM cars are interchangeable, but disk brakes were only offered in 67-70. The B-body cars are the Olds 88, Pontiac Bonneville, Chevy Impala, and Buick LeSaber. The C-body cars may also interchange (Olds 98, Buick Electra, and Caddies) but someone else needs to verify this. During this year range each GM division had unique spindle design and the DO NOT interchange only Olds 88 and 98 interchange. Henry