Mostly I do avoid them. I have stocked up on a lot of reman kits - or sourced or made my own. For my 96, which is a 1968, I sourced bearings like normal, and made gaskets by hand. A bit tedious but rewarding. For things like brake calipers, I reman those.

When it comes to irreplacable parts that wear, I gave up on finding new ones for exorbitant sums. The ill fated 900 dashboard comes to mind, baking in the sun. You'll find collectors boasting how their is uncracked, but mine is as well - given 30 or so hours of using a plastic welder and a lot of sanding it even looks half decent.

For 3D printed parts, Jordan Pagano and other have been doing it a lot longer than myself, though I have built out some vacuum manifold pieces that are NLA. In the end - I am more focused on replacing that plastic with something long term. In the case of the vacuum manifold - i took a leaf out of my Porsche 944's playbook and tapped in brass fittings, that don't leak and will never wear out! Another example is the key barrel system, which combines a reverse lockout, and starting functions, and the switch is NLA. I'm now getting ready to order a retrofit keyless fob system. The key barrel will be removed and replaced with a knob that requires no key - and since my door key barrels, and my replacement sets are wearing thin - I found a system that can also send a 12v trigger. That'll be my key going forward to lock and unlock the doors. upgrades people, upgrades...

So, it's fun. It's really fun that saab used similar systems. the Jetronic, K-Jet and others are all over volvo, porsche, saab, bmw, of the 70s-80s-and-90s... Hell my 96 even has a Solex carb...

That's not to say I haven't stripped a few 900s down. I must have a half dozen axles in my shop I rescued, cut up body panels and little pieces scattered - and a very good friend and addict who has about 20 of them in his backyard.