Those calipers look like a nice upgrade from Wilwoods. Piston seals, all internal passages. Looking at their website, it wasn't obvious that they have adapter brackets for the Pantera. Do they or are you modifying one of their universal adapters?
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.