Apparently bumpers for 78-88s 4-doors, Buick and Olds share, but nobody else. I don't know the differences with other cars, but they are different part numbers both front and rear. The reproductions are way cheaper than the originals. So let that be your guide as far as safety equipment.
I only include the part number in the event they're found new somewhere or in case they stamp the numbers on them. I don't recall if they do or not. I don't recall seeing it but who knows. Plus, if you run across a junker somewhere, you know what should and shouldn't fit your car.
22502043 is the steel rear reinforcement bar.
22502042 is the aluminum rear reinforcement bar.
Fits 78-80 rear. And up through 87 4-door only. A/G-body Olds and Buick except wagon.
Again, 81-88 2 door is different than earlier models.
Just a note on the 81-88 2 door reinforcements both front and rear. Olds has their own. They no longer share bumper reinforcement part numbers with any other car.