S10 upper and lower a-arm will bolt into a G-body (Monte Carlo, El Camino, Regal/GN, Malibu) and the lower a-arm will bolt into a 3rd gen F-body (Camaro, Firebird) but will not bolt into a B-body. The B-body is bigger and uses heavier duty parts. The only real difference between the S10,G-body, and F-body a-arms is the size of the steering stops. Small stops used on 15" wheel and large steering stops used on 16" wheel. So all G-body's have small stops all S10's have small stops except ZQ8 suspension package that has 16" wheels and the F-body's have alot of each the since most early 80's had 15" wheels and most late 80's early 90's had 16" wheels. The only other difference is the 1LE suspension package on the F-body's they have stiffer a-arm bushings.