Notes: 129008-22900 PISTON ASSY, 0.25 OS is original YANMAR product. 129008-22900 PISTON ASSY, 0.25 OS5 is commonly used in transmissions/axles/engines 4TNV88-BGGEH, 4TNV88-BGGEHR, 4TNV88-BGGEC, 4TNV88-BGGET, 4TNV88-BGGE, . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849