It is always a problem, I remember buying a starter motor for a Chev a few years ago from some place in the Northern suburbs. I had to have the ebay number because I wanted to pick the motor up. When I got there it was only a very small place sort of a shed but it was jambed to the roof with boxes of starter motors of all types. Only one bloke sitting in the corner with a computer. I asked him for a Chev starter and he had no idea just kept saying ebay number. Once I gave him the number he went straight and picked it out. He had no idea of the products only that they were starter motors