You can find them sometimes on first generation s10/s15 trucks, blazers, and jimmys. I've noticed more on the blazer/jimmy bodies, 1994-down, than on the trucks, 1993-down.
Some fbodies also had them as mentioned before, more camaros than firebird since the born warner 9 bolt was more prevalent in firebird-based cars and didn't get them.
Oddly enough, on the 8.5" rear end gn/ttype/442 cars they were mostly just on the non-posi rears from the factory.