A bodys used 20 inch fronts Bs used 22 after 66. 65 and 64 were 21. IIRC 62 63 which actually werent B bodys were 20s.The MP hangers wont work on a 64/65 b body.You have to redrill them to fit without mods.You need to use the ones Andy a member here makes.For an A body SS springs bolt right in.