Notes: 121400-01640 PLUG, 16 is original YANMAR product. 121400-01640 PLUG, 165 is commonly used in transmissions/axles/engines 2TNE68C-ENP, 2TNE68C-ETR, 2TNE68C-KG2, 2TNE68-DB, 2TNE68-EDB, . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849