Your local Kragen or Pep Boys should have one, the former is where I just got mine.
Part # 333-180 Robert Shaw or # 330-180 for the Prestone Peformance equivalent. Go with the part No.s in hand as likely if you ask for a Pantera or 351C t-stat the guy will give you a regular Windsor type ...just speaking from experience, that is why I researched the actual part No.s. and went back knowing exactly what I needed.
Julian
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.