Amazon.com : Shimano Ultegra Di2 RD-R8050-SS Rear Derailleur - 11 Speed, Short Cage, Black : Sports & Outdoors
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Shimano Ultegra Di2 R8050 Front Derailleur Rear Derailleur SS/GS 11s Road Bike Set RD Short/ Medium Cage Original Bicycle Part|Bicycle Derailleur| - AliExpress
Shimano Ultegra RD-R8000 R8050 SS Rear Derailleur Inner Plate (for Short Cage) | eBay