Bumpers...Do stock ones have part no's

Before I send my barracuda bumpers out for rechrome I want to make sure that they are orig. I cant seem to find any stamped chrysler numbers in the bumpers, perhaps they did not do that. what I did find on the rear bumper was the leters "M&M" stamped with an old punch type stamp. I just want to know If I should spend the $$$ to have rechromed, or go repo.