Yeah, it seems one of the have-parts-made-in-China companies has now branched into gas caps. It's always hard to tell where these things are actually coming from. Who's actually having them made and selling them directly to end users, vs. who's buying them and then reselling them to end users? They all claim to be the source ("We make it in our own factory", "We have it made to our specs", "It's our design", etc.); this is a very Chinese business practice and it's one of many such practices we're going to have to live with, like it or not, as China becomes the world's dominant economy. Hooray!
Anyhow, the outfit in Wisconsin (Vansautolic and various other names) seems to be a likely origin point for these caps, which they are selling as "1967-1976 A-body". Bzzt! Wrong! It takes three different caps to cover that year range. I advised them of this and they said they're checking into it; seems they(?) sent a whole '68 Dart "overseas" (i.e., to China), and it looks like there might have been some guessing. Gosh, the body shell's the same from '67-'76, so I guess the gas cap has to be the same, right?