SHIMANO XT M8000 PULLEY REAR DERAILLEUR TENSION GUIDE PULLEY SET - Y5RT98120. Compatibility - Shimano Y5RT98120. Shimano item no.: Y5RT98120. Advanced Dyna-Sys11 MTB pulley set for XT 11-speed. Precision sealed bearings in both guide and tension pulleys keep drivetrain smooth and friction-free.
eBay