The last 8 of the VIN will be stamped on top of or the backside (radiator side) of the radiator support. Last 8 of VIN will also be stamped on the top of the speaker tray/shelf near the drivers side speaker hole. Since the VIN tag is gone, it's about a lost cause for the original VIN to be used, even though duplicates are readily available. Someone may have another Duster registered with the original VIN tag somewhere, so that would be a big stink. Too much potential there anyway for a nice race car to risk it unless you get a state issued VIN. Good luck with the sale.