Amazon.com : New SR SUNTOUR SP12 NCX Suspension Seat Post, Shock Absorber Post, Suspension MBT Seat Post for Most Mountain and City Bikes, MTB, Most Sizes Have (Load Weight 132-220lbs) (Black 350mm,27.2) :
SR Suntour SP12-NCX Suspension Seat Post | Tour on a Bike
SR Suntour SP12 NCX 27.2/28.6/30.8/31.6 x 350mm 400mm Suspension Seatpost MTB | eBay
Amazon.com : SR SUNTOUR Unisex's SP12-NCX Seat Posts, Black, Ø 27.2 mm : Sports & Outdoors