Just my
I don't know how many of you have actually been in an assembly plant, but I can tell you it is NOT as structured as you think. In 1994 I watched Ram Trucks, Minivans, B-Vans (which at the time were still being welded together by people), and Intrepids being assembled. Things were much more efficient in 1994 than in the musclecar era, and the variations of the parts in the bins, and even more so how they were put on a vehicle, was staggering to someone who THOUGHT he knew how things worked. The reality of how a vehcle is assembled is FAR different than the perception. If guy at station is bolting something on the last thing he cares about is if the bolts he is using are all the same, it's just a job to them just like in 1970. Moral of the story is you are asking for proof of the unprovable here.
--Jeff