Stumpjumper chainring

Got a 2009 Spesh stumpjumper expert carbon and need to replace the outer chainring. It's a shimano and been told it's a XT but theres no numbers on it, will any shimano ring fit or does it have to be a XT? A lso what would be a good replacement in terms of upgrade to the ring?
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Like I said a XT 760 or 770 will fit may need a tweak with a file.