Notes: 129903-22901 PISTON ASSY, 0.25 OS is original YANMAR product. 129903-22901 PISTON ASSY, 0.25 OS4 is commonly used in transmissions/axles/engines 4TNE98-HAF, 4TNE98-HYF, 4TNE98-HYF, 4TNE98-HAF, . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849