You should try walking in to get parts for a Cobra replica with 65 registration/title, a 2014 build date, a 70 428 block, 61 390 hi-po heads, 63 427 intake, late model carbs, 63 427 dual point dist, toploader of some year - I forget, jag differential/suspension of unknown year, Chev front calipers from 70s/Girling rear calipers, etc. if they insist on having a year and model I just make it up to match the part I'm seeking as closely as I can. I need a fuel pump. What year and model - yeah, OK try a 70 428 CJ Mustang.
My favorite parts house story is from some car buddies of mine, whose very car parts-savvy wife walked into a parts store and asked for a distributor rotor for a 69 Hemi RR. The kid looked in the computer awhile, then went in back and rummaged around and then returned with a good sized box and plopped it down on the counter with a big clunk. She was kind of startled and looked at the box and it was a disc brake rotor.