howdy Kev! welcome to the garage - you'll figure it all out around here, and if ya don't it's cuz we haven't!
tan?? black?? never seen a TF truck that was other than a silvery gray, w/ darker gray on top the dash and on the steering column and floor - what color is your steering wheel? the wheel, column, signal cup, column-to-dash mount, floor and steps are all the same darker gray - top of dash is similar but a non glare [sort of eggshell] finish [the darker color is called "charcoal" tho it's not real black], the rest of the dash, inside the doors, posts, back wall are all a gray called "Marble Gray" - there were some 8-9 trucks, not 57, with the beige interior, but uncommon I think, maybe an option - look behind the gas tank where there's likely to still be some factory paint
don't think you'll find modern number equivelent, but the marble gray was Duco lacquer # 73604, charcoal has no number I've ever found -
Jim Carter Truck Parts has some that should be pretty close , and other suppliers that have paint may have it as well
have you sent any pics to the gallery yet? we like pics!
Bill