I have bought alot from Precision ProFormance and had good luck with everything, and they have a catalog online. I have also had good luck with Dennis Quella, Jerry at PI Motorsports, Wilkinson, and Hall Pantera.
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.