2009 GSA 1200 rear shock
 

After 120,000km My rear shock has started to leak Looking for info on getting a new one where to buy etc it is the full ESA adjustable shock I thing I would like to stick with the BMW shock as I traveled with a friend who had changed and rebuilt his Olins three times

There is a point therein: many argue that a rebuildable shock absorber is preferable to one that is a "throw away" item i.e. cannot be repaired.

Outlaw, you are in the bar/pub with your question, but you could look in the BMW tech forum and find quite a bit of discussion about the merits of various shockers.
There is also quite a bit of discussion about all sorts of shocks in the other bike tech forums (and it is not all specific to certain makes and models of bikes).

Alternatively, I've just tried out the search function in here which has been upgraded recently and it came up with this:-
Search | Horizons Unlimited

Thanks for that Dave I am relatively new to this so I will check out the BMW fourm