What year is your car? Only 73 and newer have a tab there , otherwise it is only the two rear screws that hold it on the body. If yours is 73 or newer the tab has a plastic nut that snaps in and screws the cover to the tab.
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.