[D.PASSMORE]

Not to deviate to far from your question Tom, but I believe Special K is correct on the 71/72 information. My 70 C30, when bought a few years ago appeared to have stock interior, off white color OE vinyl seat cover, door panels and visors, sandalwood brown steering column and dash pad. It came with a OE rubber/vinyl floor mat, no carpet. But what struck me is that the top dash was painted the off white color / flat texture. I found that was standard practice in truck cabs. Never knew that.
On the carpet, AAC is the best I've found to be near to the exact GM colors.