Recently, the rear bumper on my '82 fell off because the aluminum bracket inside broke. Apparently, this is a common problem and good replacement bumpers are hard to find. Here's a fix that'll cost you not even ten bucks for both sides:
Shopping list (per side):
2 carrier bolts, 3/8" x 4 1/2" (Home Depot)
2 lock washers, 2 nuts
2 exhaust pipe clamps 1 1/2" (auto parts store), you won't need the U-bolts
Take off bumper including shocks, drill two holes from underneath, assemble as shown on the picture.
This is all you'll see, and you can see it from underneath, only...
Just an idea, I'm sure there are many more 'fixes' out there...