yes but Monte SS wheels were a 2nd gen Camaro (friend of mine had a 80 Z28 had a set of them in black) item not 3rd gen and yes 3rd gen Camaros did have coils, but the rear end setup was still VERY different from the 78 up A/G body.....F,K,X bodies shared simular architecture and component interchange....A, B and G bodies had simularities and limited interchangiblity (i.e. 3rd gen Camaro 1LE rotors would fit a G-body if you used taller
B-body spindles). Yes the 3rd Camaros did have 2 different wheel sizes/offsets and yes it was common for 4 IROC Camaro fronts to be installed on G-bodies