Ronnie,
Do you think that it is an original 1963 color?
Nonetheless, Ronnie's suggestion is good. There were no interior color codes available for the interior of my 54/55 GMC COE. PPG did a color scan/match on the two colors (one had a metallic sheen) and the matches were superb. They scanned clean interior areas/parts that were not normally in the open.
Good luck - by the way, nice truck and nice words on it.
