"(or more likely one of their suppliers)" I don't think I was assuming that ... but your point is valid. Certain car parts have indeed been the same for a lon

"(or more likely one of their suppliers)" I don't think I was assuming that ... but your point is valid. Certain car parts have indeed been the same for a long period of time. You'd certainly want to avoid the suppliers that are resistant to change or that have historically taken many iterations to get to the point where they can produce 10s and 100s of millions consistently. There are however manufacturers that specialize in smaller runs and more precision (two within 20 minutes of where I type this which is NOT considered a traditional manufacturing area). I'd be willing to bet those managing the supply chain for the car companies know exactly which type of company is which (where do their engineering departments have short-run prototypes made?)