The interior offerings should be found at the Hamtramck Historical site. When it comes to the color codes & such, I can't find my '68 color charts, but someone here should have them. My '69 & '70 charts are probably no help to you.
As you probably know, the dash, ashtray, column and windshield header molding would be suede finish, interior metal (doors & quarters & side headliner mldgs) a gloss finish. Package trays, seat belts, and plastic pieces generally match the darker of the interior colors.