The 84' and up bumpers do not work on the older 78'-80' but you can still go with some aftermarket 78'-80' fiberglass bumpers and modify them to your liking, the blacking out of chrome I feel will also look good.My best option may be to black out everything in front. Fill in header panel after removing hood ornament and tuck the front and rear fiberglass bumpers as well as i can..
Do the later body style (84/87) regal bumpers (@ least front) fit these cars with minor modification? Vfns site makes even the glass bumpers look more sleek for the later model cars. Maybe do this and put amber colored parking lights in the bumper rather than clear..