Punkdog, do not be deterred by 9193 being a "semi one-off car". On the contrary, this makes it potentially more valuable on re-sale, which would help you justify/recoup the costs of the restoration. It being a special order car will make no difference to the ease with which it can be restored. You will not have any difficulties finding parts. We have great vendors that, between them, stock any replacement part you could conceivably need.
Husker, I understand that 9193 is advertised by the owner as a 1979. My point was that I believe this to be an error, for the reasons I set out.
What you say about the Euro vs. US spec GTS Panteras is absolutely correct for the Ford-era cars. However, as far as I know, post-1980 GTS imports into the US were equipped similarly or identically to the GT5 and GT5-S in terms of the mechanical and interior upgrades that came in 1980. I am aware of only one (unconfirmed) L in the 9000 series (9047). In other words, starting with 9001 the GTS effectively became the "base" model and not an upgrade. In terms of the differences between European and US GTSs in the 9000 series, my impression is that they were built on a custom order basis, at such a low volume, and brought to the US under so many different circumstances that I would hesitate to make a generalization about the respective equipment and trim levels.