Notes: 129005-22900 PISTON ASSY, 0.25 OS is original YANMAR product. 129005-22900 PISTON ASSY, 0.25 OS5 is commonly used in transmissions/axles/engines 4TNV88-ZSTB, 4TNV88-BXYB, 4TNV88-BXYB1, 4TNV88-BXPYBBT, 4TNV88-BXPYBB, . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849