I compressed the 'hat' a bit in a vise and dug at the snap ring with two small screwdrivers, when you're about to give up it will finally pop out.
This is what you'll find inside: http://pantera.infopop.cc/eve/...=723108993#723108993
PANTERA INTERNATIONAL
A DE TOMASO CAR CLUB
Presents the De Tomaso Forums
The On-Line Meeting Place for De Tomaso Owners and Enthusiasts From Around the World
Clicking on the banner will take you to the sponsor's website.