Whats up all, NEWB here with a 83 c30 ???

[Mangled03gmc]

Hey guys whats up? My name is John, I have been on a few performance truck sites for some time now, pretty versed in most of the late model stuff, but some of the earlier stuff I am not up to date on. Any how my Dad just picked up a reg cab C30 2wd dually, BBC, 400 turbo. Was curious from what year to year rear bumpers fit this truck? 80-87??? We were thinking about putting a new style dodge ram rear bumper on it with the exhaust revisions in it. Have a 6-8 lowering kit lined up, some nice alcoa's.. Any help is appreciated