Package shelf coloration and/or source for new

I haven’t found a “for sure” source for a ‘66 Chrysler Newport rear package shelf, just various C bodies models from other years.

Given that, I might make my own from hardboard, using a jigsaw.

How were package shelves colored? Paint? Dye? Vinyl covering? My original is badly damaged and I can’t determine what specific color it was originaly, or how this color was applied.

My interior code is L7R.

Thanks for any insight…