The Line worker has a special rivit gun. It runs off air has a compartment for the cast off metal post. The rivits are all attached to a Stickie flypaper type of holder that feeds into the rivit gun. You tear off one side of the paper and feed it into the gun. Now I have not seen every plant so did all plants use the same format to put the VIN on the dash.There is a very slight difference between General Motors and Chrysler Rivits, nothing physical except color on the posts once rivited to the dash.Never looked at Ford and how their VIN is attached. I believe the VIN rivits were mandated by the Government on all new Vehicles. Not sure the first year Chrysler used them but someone with a pre 1968 car could tell one more if their car had the flowery rivits.

It would be a pain in the butt ti change them now, not sure if there is enough room to fit a gun in between the window and the dash. So if no room your choice is pull the window or pull the dash.