They reproduce the data/cowl tags pretty reasonably. The VIN tags however, I'm not sure. Someone has to be out there reproducing them. There's not much to it, just getting the pressings and the font correct. If cowl tags are being repro'd perfectly, the VINs can't be too hard either. I don't know about the legal ramifications, and I don't see it as much of a grey area, there's a legal issue or there isn't. The car hasn't been re-bodied, it is just a part that is damaged. The VIN tags are commonly removed during restorations for cars that are being sandblasted/stripped as they can be damaged during this process, and the rivets aren't anything special either. If you order a new VIN plate off someone, go into a dark shed, destroy the old one and put he new one on, no police officer or court is going to be able to recognize they have been replaced by simply looking through the windscreen of the car when it's reassembled.