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Amazon.com : E Bike Seat Post Tube, Ø 25.4mm, Electric Bike Seat Post Foldable Bicycle Metal Seat Post Tube Easy to Install Bicycle Accessories, Silver : Sports & Outdoors
Amazon.com : UPANBIKE Bike Seat Post Aluminum Alloy Extra Long 17.7inch(450mm) Replacement Bicycle Seatpost φ 25.4 27.2 28.6 30.4 30.9 31.6mm(25.4mm) : Sports & Outdoors