Amazon.com : Zipp SL Speed Seatpost Di2 Battery Mount One Color, 27.2mm : Sports & Outdoors
Shimano PRO Di2 Seatpost Battery Holder/Mount fits 30.9
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Shimano PRO Di2 Seatpost Battery Holder/Mount fits 30.9mm ~ 31.6mm | eBay
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MPart Di2 Seatpost Battery Mount for seat post ID 24.5mm to 28mm (Post size 30.9-31.6)
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Shimano BM-DN100 Battery Mount for SM-BTR1 Di2 Battery-Pack | BIKE24
Cannondale KNOT 27 Di2 Seatpost Battery Mount K32180 | CannondaleExperts.com
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![Universal Cycles -- Shimano SM-BTC1 Di2 Bottle Cage Battery Mount [ISMBTC1]](https://www.universalcycles.com/images/products/large/70432.jpg "Universal Cycles -- Shimano SM-BTC1 Di2 Bottle Cage Battery Mount [ISMBTC1]")
Universal Cycles -- Shimano SM-BTC1 Di2 Bottle Cage Battery Mount [ISMBTC1]
Canyon Speedmax CF SLX Di2 Battery Holder GP0003-01 | CANYON US
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Pinarello Seatpost Internal Battery Mount for Di2 - Components
