I would broaden this topic to include insurance companies who cater to classic car owners as well. I called a well known company many here probably use, and their knowledge/information base for parts was based on what their vendors sell for each model and tell them is correct.
I was baffled , and told the guy that is like the tail wagging the dog. I also explained that benefits the vendor, and not the client. I know they insure many different types of cars, but to not have a handful of experts to refer to?
Ironic thing about it is, they actually have the largest amount of original cars that they insure to draw off of, but do not utilize this resource.
They are very top heavy on employees with insurance experience who "like" older cars, but very slim on hiring knowledgable car guys, who could learn the insurance side of things.