what back derailluer do i need

Chillyonacid
Chillyonacid Posts: 39
edited December 2014 in MTB buying advice
hi guys my back derailleur is playing up and I've been told to replace it. the thing is i don't know what will fit on my bike and where to start. i got a specialized fsr pro 2010 model

according to my bike spec online i got a Shimano RD-M772 Deore XT Shadow, long cage. i cannot find an exact replica but i did find this

http://www.chainreactioncycles.com/shim ... lsrc=aw.ds.
any other recommendation or tips would be great
thanks

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