Notes: 129001-22930 PISTON ASSY, 0.25 OS is original YANMAR product. 129001-22930 PISTON ASSY, 0.25 OS5 is commonly used in transmissions/axles/engines 4TNE88-EPZ, 4TNE88-PZ, 4TNE88-ELAN, 4TNE88-LAN, 4TNE88-EHYS, . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849