Notes: 129004-22900 PISTON ASSY, 0.25 OS is original YANMAR product. 129004-22900 PISTON ASSY, 0.25 OS5 is commonly used in transmissions/axles/engines 3TNV84-GDG, 4TNV84-DMW, 4TNV84-GGE, 4TNV84-KVA, 4TNV84-KWA, . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849