The bottom one is from a 72 Cougar and apparently for the Pantera the air horn was moved 180 degrees and the hole in the side from the original air cleaner for the Pantera location was blocked off with sheet metal and rivets as you mentioned previously. The top one is from my 72 Pre L.
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.