The color keyed grille was an option in 72, it had to be a "Cuda" and had to be one of the six specified colors, it appeared to state that no coding was required with G36 color keyed mirrors. These grilles came with an argent (not orange) accent loop. I own one..... it's a 1972, G36 FE5 coded 340 4spd V21 car. The original owner stressed to the 2nd owner that it came from the factory with a painted grille, and he relayed this to me . I also wondered if Ma Mopar may have pulled the plug on that option before production ended I have documented several color keyed grille 72 Cuda's, off the top of my head I think they went later than your build date.