Shimano Part Number: Y5XC98140. XTR RD-M986/ M985/ M981/ M980. Shimano XTR 10-speed Jockey Wheels RD-M980. Premium Dyna-Sys MTB pulley set for 10-speed XTR and Saint. Precision sealed bearings in both guide and tension pulleys keep drivetrain smooth and friction-free.
eBay