For a '51 I have been told the interior color was a maroonish color, a brownish color, and a grayish color. I talked to a guy named Bob Adler who is a well known expert in AD restorations. He says that Carter's sells an interior paint that is the correct color. I have not yet put it on anything so don't yet know what color I would call it. I have also heard the seats and door panels were brown as longbox says but others say they were maroon. Bowtie Bits sells the "original" color door panels and they are maroon.The seat in my '51 Deluxe appears original and its brown. I am amazed that there is so much confusion. There HAS to be trucks around that still are original and you would think that the correct colors would be common knowledge.