I have OEM parts catalogs for sale for various makes and models. They are on standard 4x5 microfiche cards which most university and public libraries have and you can use free of charge (if not, I've seen the readers on Ebay pretty reasonably).
Same data the OEM parts counter uses (because it is the OEM microfiche). Complete with charts, part numbers, illustrations, and a ton of data about the specific vehicle in question.
Drop me a line with any questions. Thanks. Joe--ASE Certified Parts Specialist & 10th Ann.Club Tech Director '80 Carousel Red Turbo T/A, 26k orig. '79 "Y89" 400/4 speed 10th Ann. T/A, 57k orig '84 Olds 88 Royale Bgm 2 dr, 307 "Rocket" (lol), 141k and still going.... '80 T/A project car...