Amazon.com : Seat Post 600mm Bike Seatpost Aluminum Alloy Bicycle Seat Post with Micro Saddle Clamp for Mountain Road Bike,Black,33.9*600mm : Sports & Outdoors
Radio Raceline Seat and Post Combo (Black) (600mm) (31.6mm) - Dan's Comp
Carbon Fiber 31.8/33.9/34.9mm Folding Bike Seat Post Length 600mm Seat Tube | eBay