by dave-r » 06 Oct 2007 13:54
It just fits on with sheet the metal screws that hold the filler neck to the quarter panel. Totally obvious when you see it.
You need the flip cap, trim ring, and a small diameter screw cap that fits inder the flip cap as the flip part is just a cover.
Do a search for flip cap or something and you will find a few detailed photos on here somewhere.