Ivy66GT, do you mean the buck tag? I have both my fenders off right now, and I only have 1 hidden vin. I know that my driver side front inner fender was replaced, but the rear inner fender is original, and there is no VIN there. There is the "hidden" VIN on the passenger side rear inner fender.
1966 Mustang Sprint 200 "Oliver"... factory fog lamps, factory rally pac, off the road for restoration.
2005 Mustang 4.0 litre... Airaid CAI, Honeycomb taillamp panel, more mods to follow.