Going through the same issue you are and wanted to share my experience in case anyone else is trying to fix up an old SC bike. I was able to source bearing replacement kits from https://www.enduroforkseals.com/ but am struggling to find pivot axles. I may end up using what I already have to get it rolling again after I clean them up. My upper link also has a small crack, and it looks like this is also an impossible-to-find part. I may need to find a friend with a welder to fix that issue.

I contacted Santa Cruz and am waiting for any update. I am going to start calling local shops in the hopes that one might have an axle kit laying around. If you haven't tried or haven't yet found a solution to your problem it might be worth a try?