Cool things with wheels since 2006
I think it's just as simple as trying to make hubcaps look like actual knockoff wheels, and by knockoff I mean "remove with a mallet," not "copies."
After market? Aesthetically pleasing? J.C Whitney? All of the above? Dunno.
That is a kit you could buy in the early 60's that consisted of a plate with a round stem or tube that mounted behind the steel wheel and after the lug nut were tightened then the cover went over the stem and was held in place by I think screws that attached the spinner to the stem. I had them on my 62 Corvair.
Well then, that's really kinda cool.
Just think of it Jesse, someday there'll be a guy posting pictures of 40 year old Camry's and wondering what was up with the fake fender vents and fart cans.