I'm not expert on the industry itself, but I would observe that a number of factors come into play choosing a location for an auto parts company. Proximity to your customer is important, but I think it depends on what you're making. If it's a complex high-end product, typically a closer proximity to your customer is more important, but if it's a commodity that can be shipped very cheaply, then it would be less important. The other things that come into play are the business environment and access to a good labour force with high levels of skills and that sort of thing.
I think geography is significant, but increasingly these companies are footloose, and they're moving here and there.