Maybe it's the wrong part, but $18.00 at Wilkinsons if it's the right one.
http://www.panterapartsusa.com/cgi-bin/detail.cgi?prod_id=16014b
I've ordered this sort of part from them and they were all genuine OEM parts. Good luck.
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.