ClassicCar

There used to be a number of companies across the western states who cast pot metal license frames as advertising for the car dealers, for organizations, for Pep Boys sales etc. Some of these probably still exist despite the fact that frame use by dealers has mostly given way to plastic or to glued scripts for trunk lids. I contacted one such company in Riverside, CA years ago but don't recall the name. Another thought would be to have any foundry do them in aluminum which would be inexpensive and could be polished, or in red brass which would chrome and be outstanding. But you need an original to work from and keep in mind there will be shrinkage in the size of the recast part depending on material used.

If you do find a company (internet search???) please post it here.