I spent 6 1/2 managing a NAPA store back in the early '70's. We made it a point to know our parts and be able to help anyone that came in without whatever 'odd' (not in the book} parts they needed. Since we also made hydraulic hoses and stocked 'big-ole' truck parts, filters, etc., I made sure that all out HD and hot rod customers had home phone number with an understanding that I would open the store for them after hours if it was an emergency.
Now, fast forward to today. My local NAPA store just ignores walk-in customers. They are too busy answering the phone, pulling parts and delivering them to the repair shops in the area. When I did get someone's attention, I told him I needed a CS788 and a RR176 (yes, I still remember the part numbers). He looked at me with a blank stare and asked the 'duh, what year car'. I told him it was a 1980 Harley Davidson converted from electronic ignition using a points place out of a 1960 engine. He just mumbled, 'we don't have motorcycle parts' and started to walk away. BTW, those 2 part numbers are points and condenser for a 1970's Chevrolet with a 6 cylinder engine. I doubt if he would even know what they were if I showed them to him.