Will a '55 2 door hardtop body fit on a '55 4 door sedan frame?
Will a '55 2 door hardtop body fit on a '55 4 door sedan frame?
Yes. The hardtop body has an extra body mount though (one each side). You can buy the brace for it as a repro, or you can transplant them from your hardtop frame. Location is in the 55 assembly manual.