I have a '75 Scamp parts car with a SBP 7 1/4" rear. I was told by someone once they killed the 7 1/4" rear when they killed the a-body and went to the Volare/Aspen cars. Don't know if it's true or not.
They used them in A-bodies until the end of A-body production, used them in F-bodies and also used them in 4cyl & 2wd v6 Dakota's until the new body style in 97.