I've seen two versions of the curvy Revson front spoiler. My 1980 version looks exactly like the #2 photo while the later ones have a splitter-like horizontal lower extension.
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.