Alot of people make fake tags so they can make fake cars.Now b41 and b51 will be on the fender tag becouse of the bodys in white,it also had to do with the package code that the car was ordered with,the fender tag also told the service department at the dealer what the car had and how to service it,say you ordered an r/t you would get certain things in that package,if you ordered a t/a,you already ordered certain options as part of the package,certain codes were not on the fender tags becouse they were part of the ordered package.Now if you ordered a bh cuda with pdb,ps,pw,heavy duty suspension,383,a/c,auto,you just odered a car by checking the boxes on the order sheet,you didnt order a certain package you basicly made your own car,quess what??? it would all be decoded on the fender tag and would that be a cool car or not??