I did also notice that the interior had two-tone seats, which were only used in the post cars.
As I was pointing out, there were only four colors for post "GS" interior. Those colors were black, blue, red and saddle. With that said, the Reynolds car could have only had a saddle interior, from looking at the picture and considering the contrast between the two colors of the seat in the picture.
Going with the Saddle interior, the dash, steering wheel and carpet would have been saddle. The headliner would have been Fawn color.
Loren