Yes, once the tag was actually attached to the firewall of a tub, the car was built, all its parts and peices were on hand in the plant and the car was built, once a body started down the line it was not pulled off to wait for something to arrive at the factory, no one could contact the plant to make a change to the order. The things people miss in the production of these cars is that the tags were made up as the orders came in and the bodies were preliminarily scheduled, parts were ordered and the tags were placed in groups that roughly equaled a days production. This all happened several days to a week prior to the actual start of the build. The plant could then make minor changes to when an actual car would be built, based on things like how many convertibles were in that days group as you couldn't have 2 convertibles coming down the line together as it would overload the trim shop - typical spacing is about 12 to 15 bodies, vinyl tops has a gap of about 5 to 7 bodies. LA had different concerns as they were building multiple lines of cars at the same time. If a part necessary for a particular car to be built was delayed in shipping, the tag for that body was pulled from its original position and put into another group scheduled to be built after that part arrived.