I have a set of these. They are super nice. Look identical....and I mean absolutely identical, to FoMoCo units except for the lack of a Ford Crest. The seller offers them for all kinds of cars, so I assume he is some type of manufacturer.
It is exceedingly easy to make plastic molds, and even easier to build a injection molder from parts. And, machines can be had for reasonable prices. Very reasonable if you know where to look. So many ways to mold plastic it's ridiculous.