Chances that the one on Craigslist is for a dash-1 are slim. Only about 5-600 panteras got them.
Both centerforce and Mcleod have a pantera specifik clutch for the dash-1 with the 1-1/8" x 10 spline.
Pantera performance in Colorado sell the McLeod with a diaphram pressure plate. I used it with my dash-1 and it was very light to operate even without the effort reduction kit installed. It needs an adjustable throw out bearing that they also carry.
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.