I'm wanting to find some of these (about four or five of them) for some specific locations.  Also looking for old F14T12 vanity lights.  PM me what you have!

Sorry if this is a stupid question but what exactly is an F20/15 adapter? Do you mean like one of those screw in linear fluorescent adapters?

I believe he means this.

Cool concept, quickly installed, and quickly removed if needed. You need a screw in 2 prong receptacle for the existing ceiling fixture, though.

Those are them