Standard Kubota KH-28L piston and rings. Part # 15201-21110, 15201-21052 See our store or call for complete overhaul kits 82MM diameter White Horse Distribution Specializing in parts for engines, hydraulics, driveline and electrical since 1995. If you have any questions on this Item, reach out to us. (Alaska, Hawaii, Puerto Rico & The US Virgin Islands will have an additional surcharge). : We carry parts for Engines, Transmissions, Front & Rear Axles, Hitch & Drawbars, Undercarriages, Final Drives, Seats, Bearings, Cups, Cones, Seals, Discs, Couplers, Gears, Brakes, Pressure Plates, Pilot & Throw Out Bearings, Ring & Pinions, Gaskets, Decals and MORE for most wear items. We also carry replacement parts for the Boom Cylinder (Seal Kits, Tubes, Glands, Pistons, Rods). We take pride in our feedback rating. If you are not 100% satisfied, please contact us so we can correct the problem.