Im running the 1961 Lincoln continental front-frame and the oem rear-arm (i believe scp still sells the rears and the front poly kit of their own)
The poly is gonna be noisy but if installed correctly and liberally lubricated id imagine they will last a lot longer than anything else aftermarket.
Others have said it doesnt really matter what you throw in the rear control arm, and from my experience it seems to be true. ive never had them fail, always the fronts but just for my sanity i replaced them with the oems anyways