You can try Eriksson Industries, they not only service Saab transmissions but they also sell parts as well. I was able to get some brand new-old-stock synchros from them when I did my chillcast rebuild. Give them the part numbers and they'll see if they can match.
Another idea is if you're just looking for shims and have an existing one that you can provide a shop, they can probably make some for you out of shim stock.
Tried Eriksson Industries already - no luck.
Having some made is my plan B but I was hoping I might be able to source them somewhere.
Thanks again - Eriksson Industries is definitely a good resource to keep in mind!