I can help with the front bumper. If they are sagging at the trailing edges, it means they are not slotting into their clips on each side. The bumper comes off with 2 pairs of screws at the front and one on each side as well, and you will need to reinstall it and be sure that it slides into the clip bits properly. It will make sense when you see it.
Jack Travis, E-Series Acting President
1989 Ford Fairmont Ghia turbo/GL replica (underway)
1994 Eunos 800M
1990 Ford Laser S