They may have been used on some other Italian model, maybe Maserati, but whatever it was is probably just as limited production if not more so than the Pantera. Thus, no cost savings.
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.