I would say there is still a HUGE opportunity for a company or companies to come in and tool there products to exact specifications. I think the engineers that could pull this off are all to smart to bother with us in the classic car world though. I think 1 guy has the idea, and then contracts within China, and it all comes down to the ingenuity of the Chinese engineer(s), who probably have never even seen a Camaro, Mustang, or Charger, but has been enlisted to copy a part that was produced 40 years ago, and to do it almost "at cost", so the U.S. reproduction company can squeeze as much money out of each piece as possible.
But maybe i am way off base.....