Interior seat colour
Maybe Legendary will send you small samples of their colors to see what is the correct match. Nothin beats a piece of the actual material to double check.
Good advice. Chrysler and I have disagreed about item nomenclature before. To get what you want, it is necessary to use Mopar-speak.
To answer an earlier question, gold was not a special order interior color per se. There are several body colors where gold would be an approved color for a standard installation. However, it probably could be special ordered on a non-approved color if you leaned on the dealer hard enough. There were checks in the system that prevented red cars from getting blue interiors for instance. It would be possible to over-ride after a verification process.
To set the color of your interior in Mopar-speak, there are two places to look. First is the body tag. Under the TRM stamping, look at the third character. The other place to look is on the build sheet in block 340.
Character decodes for 1967 that may apply in this case are: Y = Gold, T = Tan, K = Copper.
The trim code on the body tag is apt to look like
P6Y. This decodes to: premium trim level, vinyl bucket seat, gold color.