One other subtle GTS difference is the gauges omit the De Tomaso logo and this car would appear to be correct. Blowing up photos looks to be VIN# 7162, which would corroborate with the Provamo registry entry and has 'GT' in the VIN.
As to 'originality' it has had a lot of work done, despite the 8,900 miles and was originally delivered as a silver/black car.