What does my hidden vin-number mean?

The hidden VIN numbers on A-body cars are on the radiator support, and on the package shelf. Unless export cars are different, there are no VIN numbers on the trunk lip. Take your back seat out, and remove the package shelf board and insulation. Somewhere on the metal package shelf, the last 8 digits of the cars VIN will be stamped. The first 2 characters will be inverted. For instance, the VIN on a 70 Duster 340 would be VS29HOB123456. The number you should find stamped on it's pacakge shelf would be BO123456. Look at the last 8 numbers on the VIN tag on the dash to be sure which numbers you are looking for elsewhere. Good luck.