The black space between the body and flares is correct. It's filled with black sealer called "dum-dum". The description and vin do fit for an original GT5. If you'd like more input, feel free to email pictures to me at mark-at-markscars-dot-ca. I can send them back sized for posting here if you choose.
Mark
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.