DLD

Anybody out there know how to read the trim codes? I figured out the paint code, it's 7, Newport Blue. The upholstery looks to be original, although in not the greates condition. The seats are a blue material, soft and sort of fuzzy for the lack of a better explanation. The carpet appears to have been dark blue. the vinyl on the arm reasts and dash is blue, and the doors have a tan woven fabric. The trim code is 15.
Any help will be much appreciated.