Too tired to go back to the shop to show you mine.., My pair (you never get a set of anything, right?).. must be from the same company. Everything is exact, except my backround piece does not have the spiral. Mine is a plain dome. But the shape is identical, as well as the sort-of "non Ford" V8 emblem.
Well now, maybe lucky "IF" you find a way to use them I think they must be something from the 50s from Warshawsky, or Almquist? Add on stuff to attach to wheel covers. Mine were half ass screwed to 6" dia, kind of flat, center caps like for an antique car.
I've checked my Almquist catalog but didn't see anything. I was thinking the same thing. I'm already hatching a plan to use them.