The hard part may be finding the weatherstrip and trim for the window. I have seen the weatherstrip available only a couple of times over the last few years. One NOS set went for around $500.
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.