Notes: 26756-050002 NUT, LOCK M5 is original YANMAR product. 26756-050002 NUT, LOCK M55 is commonly used in transmissions/axles/engines 3TNV76-CSAP, 3TNV76-GGEP, 3TNV76-HGEP, 4TNE84-P, 4TNE88-ESA, . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849