I'm not familar with 70 Challengers, the last one I restored was in 1993. But I've found on the 1971 cars that I've done that the surround trim on heater controls was some sort of chrome plating much like on A & B body dashes.
I spent three years looking for a nice original radio bezel where the chrome was still intacked for the Barrelcuda.
I also enjoy the "reverse" paint method when working with the small details. It works great every time
