What needs to be fixed on it? Almost all routine maintenance and wear and tear parts will be available for decades.
Parts that fall outside of that classificiation can usually be found at the boneyards, EBay, Craigslist, or in the Parts category on SAAB forums. They’re usually not that expensive and many things can be worked around if you’re mechanically minded or the shop is willing to improvise a bit.
I hated the rubber mounted alaternator and V-belts on my old SAAB 900 so with a little tweaking it now has a serpentine setup with a Mitsubishi alternator. The Mitsu alternator is about half the size of the SAAB unit, just as poweful, and is much more accessible if needed.
The fuel pump on that 900 is out of a Mercedes so workarounds can often be done.