I used to own a tool $ equipment franchise, and thus drove one of those cool tool trucks. Now, my truck came from a company called Precision Display Vehicles, and was rather unusual. Oddly, it had a Chrysler motor home chassis, and a Chevy 454/Turbo 400. It was not a Chrysler nor a Chevrolet product, and thus getting the correct parts took a bit of trial and error. To make things as easy as possible, I kept a notebook of all known part numbers. When going to the local Autozone, or some other consumer auto parts place, it always turned into a rather annoying conversation.
Me: I need an equivalent to a Gates XXXX belt
Zoner: What year is the vehicle?
Me: You can't look it up that way, just cross reference it.
Zoner: What year? I need a year.
Me: OK, its a 1986
Zoner: Make?
Me: Precision
Zoner: no such thing, what is it?
Me: A step van, and you'll need to cross it.
Zoner: Is it a Chevy step van?
Me: No, it's a Precision... it was a custom company
Zoner: I need a year and a make to look it up...
Me: Do you sell ammo??
In the end, I nearly always ended up cross referencing the part myself as the guy behind the counter didn't even know you could do that!
Shiny Side Up!
Bill