I'm not an expert but here's what I know about E body door handles. Challengers use one with a slightly convex (dished in) surface. Cudas use one with a concave (dished out) surface (different part numbers). Some of the cheaper repops split the difference and went with a straight face. They work just fine but if you are building a 100 pt car for the Nats you probably don't want them. $158 bucks a pair is about right for the generic ones. I don't know if anyone is doing them correctly yet and NOS units are in the Unobtaineum price range.