My 71 Pantera has the same issue, The trim looks very close to your car. Steve Wilkinson told me more than likely the guy before me used the wrong gasket. 71 Pantera windshield gaskets are one year only and cost 700 bucks. 72 and up are much cheaper but, they are slightly different, so I'm told. Maybe this could be the case for your car, who Knows. I fixed mine very cheaply, I,m embarrassed to say how I did it cause I'm a cheap SOB.
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.