The only clearly identified one of the four is the US GTS, which has "GT" in the VIN number. The rest would be more down to due diligence from the registry or some wads of cash to Philippe Olczyk if he has factory paperwork. As I understand the Euro cars were simply taken off the line randomly as orders prevailed.
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.