alt Hacker NewsTypically in the US you get a donor firewall from a registerable vehicle that has the VIN plate. This is pretty common for things like civilian jeeps, chevrolet C10 pickups and a few other American cars/trucks that have complete bodies you can buy in the aftermarket.
For military equipment you usually need the original frame (or part of it with stamps) because it has serial numbers stamped on it for the DMV to go by when registering.
Yeah it sounds like they had a rusted out donor vehicle, so they may have been able to get the necessary numbers from it. Will be interesting to read all the details of how they went about it.