Jodoolin

There is one interior piece of plastic that is no longer available from either Mazda or Mazdatriz. It is the center cap for the two defrost grills on my 90 GXL. The color is maroon. My only alternative is to buy a black cap which is available and paint to match the two new maroon grills. Is there, in fact a color code, for interior parts as there is for body paint and any ideas on how to get my hands on it?