As for Camaro's, I have a 67 RS/SS with deluxe interior and the knobs "still original" are chrome plastic, I also have a 67 RS with the standard interior and the knobs are black plastic, have a 68 CST pickup and the knobs are chrome plastic, growing up we had a top of the Chevy line 69 Caprice and it had chrome plastic knobs. If there was a supplier that Chevy used that produced any in metal we will need more of them to come out of the woodwork, personally I have never seen such an animal, but when I do I will let ya know, ya all chime in here. genminmar