Shimano Xtr M9100 1x12speed Groupset For Mountain Bike Rd+sl+cs+cn Group Shift Lever Rear Derailleur Sgs Cassette 10-51t Parts - Bicycle Derailleur - AliExpress
Amazon.com : Shimano XTR RD-M9100-GS Rear Derailleur - 12 Speed Medium Cage Gray with Clutch : Sports & Outdoors