Hi Mark. Its a rubber gasket, seal, weatherstrip, whatever you want to call it that is retained to the outer chrome belt molding. The felt on the inside is in good condition. When ever I google it they show me the vertical molding or whole kit but never just the 1/4 panel belt molding gasket. And the whole kit never specifies what is really in the kit.
How old school am I. I have the rear window trim molding clips in stock. HA!