I got them from a friend on this forum who had both a Pushbutton and a Mangusta. They are a lot better made, despite their current condition, but assumed they were from his Pantera. These could very well be from his Mangusta. These things were made like medallions and are heavier weight the aluminum silk-screened reproductions they sell nowadays. That's why I wanted to go through the trouble of restoring them. I seem to recall the Pantera center caps were brass too but not sure. Or, he did give me five caps and I was looking at the 5th one that I put in a one-slot wheel I sold a while back. Oh well.
At any rate, thanks for the info.