Notes: 129956-22900 PISTON ASSY, 0.25 OS is original YANMAR product. 129956-22900 PISTON ASSY, 0.25 OS2 is commonly used in transmissions/axles/engines 4TNE98-LAN, 4TNE98-LAN, . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849