I have just done both of mine very hard bearing to find, local bearing specialists couldn't get me one.
I got them from Splat cheaper than Beta http://www.splatshop.co.uk/ohlins-rear-shocker-bearing-large.html £22.90 each.
This one has an Ohlins number on it but I didn't keep a note.
Have you got the bolt out? Mine was a pain to move a friend heated it up for me in the end