Will Formula S center caps stay on with no outer ring?

Hello,

I just got a 1966 Barracuda Formula S. It has bare 14 inch wheels with no hubcaps or wheel covers. It also has these really long lug nuts.

I see many 1966 era center caps on EBay, but no outer ring. Is the center cap held on by the lug nuts, or do I need the outer ring to hold the center caps?

I was thinking of painting my wheels in body color, and then having only center caps with no outer rings.
Author: admin