Shimano Ultegra BMR2 Di2 Battery Holder, Black | Bikeinn
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PRO Di2 Battery Holder Seatpost Di2 Built-in Battery Mounting Bracket For Seat Rail Mounting 27.2/28.6/30.9/31.6 - AliExpress
Shimano Internal Fork Steerer DI2 Battery Mount [PRAC0085] at WesternBikeworks