Retro XT rear mech - what jockey wheels?

Hi,
Trying to source new Jockey wheels for my daughters retro (M737 - just like http://www.retrobike.co.uk/forum/viewtopic.php?t=107436) rear mech, not going to pay out for silly prices for genuine XT ones, they need to be narrow (like latest XT) not wide like the BSO ones, but not sure which is the cheapest one that is narrower as the techdocs don't make it clear.
So anyone know which of these http://www.chainreactioncycles.com/Mode ... odelID=885 will fit?
Trying to source new Jockey wheels for my daughters retro (M737 - just like http://www.retrobike.co.uk/forum/viewtopic.php?t=107436) rear mech, not going to pay out for silly prices for genuine XT ones, they need to be narrow (like latest XT) not wide like the BSO ones, but not sure which is the cheapest one that is narrower as the techdocs don't make it clear.
So anyone know which of these http://www.chainreactioncycles.com/Mode ... odelID=885 will fit?
Current steed - Whyte T129, 2013 frame, mongrel Revelations, Giant dropper, Stans S1 wheelset. 12, Magura Trail Sport brakes, 1x11. 12.8Kg
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Parktools :?:SheldonBrown
+ some other bikes.
Parktools :?:SheldonBrown
Suggests 10T......grrr
Parktools :?:SheldonBrown
+ some other bikes.