early #9000 cars were GTS (no flares), i agree the interior has nothing to do if it is a gt5 or not because early 80 GTS cars had the GT5 interior. I am certain this car is a GTS and flares were put on it.
http://www.qv500.com/detomasoregistryindexpanteragts.php
look at 9000 series GTS
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.