do you need? I was able to get most of the parts I needed form John at slspares.co.uk. He used to work
at SL and bought all the parts, old stock and I believe the rights to the old SL line.
If it's just bearings they are generic and I have the numbers for some of them that are readily available in the states.
I also bought a complete working spare 520 to use for parts or backup but not sure if I want to start stripping it down just yet.