The RP ones that I have seen were for a 67-68 and the shape on the sides was incorrect. I used an original control arm to mark out the correct side dimensions and ground the RP ones down. They actually came out really nice. The ball joint was a cheap replacement, bought some MOOG ones and used correct boots and had Marcus rivet them on. The only benefit of the RP ones is that you start with clean, pit-free metal, they will require additional work to make them look decent.