My stock early seats were redone in black leather & fresh foam by Mike Cook (who used to work for Gary Hall), but I suspect that all the So-Cal Pantera vendors use the same talented Mexican seat-upholstery shop, as the results look identical. Could be wrong, but.... I've had good luck with local street-rod upholstery shops, too. They just need real good photos of what you want your old seats to look like.
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.