I have not got into the wipper motors on the Pantera but I swapped wipper motors in my MG. The original MG wipper motors are weak so I just found a good aftermarket hot rodd assembly. Wasn't too hard to set up and can be addapted to about anything:
Some photos near the bottom here:
http://www.rc-tech.net/MGB/homestretch/homestretch.htm
Gary
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.