Shimano SHIMANO REAR DERAILLEUR, 11 SPD ULTEGRA GS, 32T MAX COG - REV Endurance Sports
Shimano Ultegra R8000 2x11 Speed Groupset Left+right Shifter Front+rear Derailleur Ss / Gs Original Parts For Road Bike - Bicycle Derailleur - AliExpress
Shimano Ultegra derailleur (6500 GS)
Shimano Ultegra 11S RD-R8000-GS Road Bike Medium Cage Rear Derailleur Black | eBay
Shimano Shimano Ultegra RD-RX800-GS Rear Derailleur - 11 Speed, Medium Cage, Black, With Clutch - Grand Rapids Bicycle Co.