My rear bumper is bent real bad after a brake mishap that sent me inbetween a school bus and garbage truck. Luckily rear quarter and bumper were only thing harmed. Anyway, I have a 91 f-150 4x4 bumper that I would like to use for the bent up one on my 87 Gmc SB v1500. Looking at ones from JcWhitneys; they look real close. Anyone have any idea if they will interchange?