Notes: 129508-22900 PISTON ASSY, 0.25 OS is original YANMAR product. 129508-22900 PISTON ASSY, 0.25 OS5 is commonly used in transmissions/axles/engines 4TNV84T-DSA3, 4TNV84T-GGE, 4TNV84T-DSA2, 4TNV84T-DSA, 4TNV84T-BGKLF, . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849