Notes: 129900-22900 PISTON ASSY, 0.25 OS is original YANMAR product. 129900-22900 PISTON ASSY, 0.25 OS5 is commonly used in transmissions/axles/engines 4TNE94-G1A, 4TNE94-SA, 4TNE94-EIK, 4TNE94-WI, 4TNE94-WI, . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849