Paolo, the good news is that the clutch components are common; The pressure plate is for a 1968 Ford Mustang, the disc is for a Chevy. The flywheel is also from a 1968 Ford Mustang. The throwout bearing is common with Pantera.
The slave cylinder can be from a Fiat X1/9 and the master is a common Girling master cylinder, easy to find. Be careful to shim the top end of the X 1/9 slave cylinder, the X 1/9 piece will leave a gap to the bellhousing and if you torque down the bolt it may stress the slave cylinder.
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.