I'm sure Jerry at Pantera International Motorsports could take care of you. They sponsor this forum and are probably the closest of the Orange/LA vendors to you in City of Orange.
http://www.pim.net/
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.