I looked it up and now I have to laugh. The 67 Belvedere I was only available with three interior color choices. Tan, maroon, blue. That means that most exterior color choices didn't have a recommended interior choice. It just meant that tan interior was the only possible acceptable (not necessarily recommended) choice.
With a black exterior, red or blue interiors were recommended, but tan interior was acceptable. With dark green, light turquoise, dark turquoise, and soft yellow, there were no recommended interior color choices, but tan was the only acceptable choice. For a white, all three interior color choices were recommended. For beige, light tan met. or yellow exterior, tan was the only recommended interior color choice and no other interior colors were acceptable. Other exterior colors like reds, blues and silver only had the other two interior color choices as either recommended or acceptable.
Most interesting is that the limited interior color choices appear to have limited exterior color selection on the Belvedere I. Unlike other B body 67 Plymouths, the Belvedere I wasn't available in turbine bronze, medium copper, dark copper, or gold.
