Joe, sometimes I wonder if some of the chain automotive parts stores try to hire guys that know cars, or just anyone off the street.
This reminds me of a story I heard yesterday. A friend of mine is finishing up a street rod and went uptown to the local autozone to get some parts for his motor which is a 350 Chevy. He told the guy at the counter he needed some parts for a 350 Chevy, guy had no idea how to look it up without the year, make, and model. He said, "C'mon it's for a 350." Guy said that he had to know the vehicle to look it up. He then said well it's for a '37 Willys. That guy didn't know what to say then, he was totally confused.
I try to avoid those stores, as I've already had an autozone alternator and O'reilly fuel pump fail on me. I just go to Napa or a good local parts store.