Notes: 26716-050002 NUT, M5 is original YANMAR product. 26716-050002 NUT, M55 is commonly used in transmissions/axles/engines 3TNE68-ELG4, 4TNV98-ZNTG, 4TNV98-ZNTGT, 4TNV98-ZNSADT, 4TNV98-ZNSAD, . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849