The original argent silver grilles were molded in silver plastic, and the surround was painted body color, the SS grille was originally molded in black plastic, and the surround was painted body color. There were 4 different factory grilles, 2 molded in silver (one standard, one RS) and 2 grilles molded in black one standard, and one RS. Somewhere in the early 70's GM quit producing the two silver molded grilles and just made the black ones. After that point for the cars that needed a sliver grill (all black cars and all non SS cars, either RS or standard) had to have the center section painted silver, and the surrounds painted body color. It's not factory to paint the center sections, but its what you have to do today, unless you can find an original grille.