I have a 67 Firebird that came with power four piston front brakes. They have been nothing but trouble so I want to replace them with single piston, hopefully later model GM calipers. Does anyone know what might fit. I still want to keep my stock 14" ralley wheels. One time I tried an aftermarket caliper and my wheels kept hitting the caliper. I did a search but it seems everyone was talking about aftermarket stuff.