You haven't seen much because relatively few such cars were built, and none were officially imported to the U,S. due to decades of restrictions. #9008 was, in the original paper DeTomaso Roster printed in 1994, another of the 'secret' Panteras in which nothing was ever submitted by the owner. That's fine for those who so choose, but it sure makes tracing things difficult for subsequent owners! By definition, all series-9000 cars were built 1978-onward for DeTomaso at Carrozerias Maggiora or Embo in Italy.
After 1974 when Ford pulled out and sold the Pantera rights back to DeTomaso, the factory would supply anything in the Euro-GTS Supplemental Catalogues as original equipment if requested, including club-racing GT-3 and real-racing GT-4 parts, sun-roofs, special paint and the like. So your car is (as all 9000-series are) very likely to be unique among narrow-body Panteras, especially in the U.S.
The best bet for owners of 9000-series cars like yourself is to go to Peter Havlik's web site in British Columbia (email@example.com), where he lists (with photos when available) 316 of the 602 total possible series-9000 cars, right up to the last Pantera Si.
Unfortunately, #9008 is not shown in Peter's 9000-Roster, either, but #9001 and #9007 are. As a SWAG, car #9007 should be a 1978-built Euro-spec GTS, of which at least 90 were made through 1989.