This is an interesting one, because your van has all the gts gear and the plates are good too BUT the glove box lid has been replaced so we don't know what tyre placard the car originally had... But your photos of the evidence of removed headlining strip suggest you either have a;
  • Base model van that has been Fully GTS optioned and with full headlining.
    or a
  • Sandman

It's a tough one because you don't have books with the car to confirm or deny so you're stuck in a real grey area. Keep searching the history of the car if you can.

If someone can post close up pics of an exposed headlining strip please do so. I will try and get a shot of mine when I hit the shed next, because the screw holes are not factory, the headlining strip was welded in I believe.