ZOOM Suspension Bike Seatpost Shock Absorber Damping Alu MTB Mountain Bicycle Seat Post 27.2 28.6 30.0 30.4 30.8 31.6 31.8 33.9 - AliExpress
DJC Suspension Seatpost Straight Pillar Headless Bike Seat Post Shock Absorber for City Bike MTB 25.4 27.2 28.6 30.4 30.9 31.6mm measure diameter before buy 28.6mm*350mm
Amazon.com : CYSKY Bike Seatpost 27.2 x 400mm with Bike Seatpost Shim 28.6mm 30.9mm 31.6mm, Suspension Seatpost for Mountain Bike Road Bike MTB BMX : Sports & Outdoors
DJC Suspension Seatpost Shock Absorber Damping Alu for MTB Bicycle Seat Post 25.4 27.2 28.6 30.1 30.4 30.9 31.6 33.9 X350MM - Walmart.com
Bicycle Suspension Seatpost Shock Absorber 25.4/27.2/28.6/30.4/30.9 31.6mm X350mm Alu MTB Bike Saddle Seat Post Tube Setback - AliExpress
MTB Bike Saddle Seat Post Alloy Hydraulic Suspension 28.6/30/30.4/30.8/33.9 mm | eBay
Amazon.com : DJC Suspension Seatpost Straight Pillar Headless Bike Seat Post Shock Absorber for City Bike MTB 25.4 27.2 28.6 30.4 30.9 31.6mm(25.4mm Black) : Sports & Outdoors