Back in the ‘80’s, I was rebuilding a starter on a small block Chevy. It was late on a Saturday, before parts stores staying open til 9:00. I walked in and the only person in the store was a very attractive, tall young lady who was mopping the floor, just before closing time. My first thought was that she wouldn’t have a clue as to the parts I needed. Without looking up from the mop, she asked what I needed and when I replied that I needed brushes and bushings for a SBC starter, she asked, “long or short shaft?” When I replied short shaft, she leaned the mop in the corner, walked to the shelves and pulled 3 boxes. Front and rear bushings and the correct brushes. She never looked in a book and this was before computers, but she knew P/N and prices in her head!
I found out later that she was the owner’s daughter and had been chasing parts since she was old enough to read the numbers.