Notes: 24311-000180 O-RING, 1AP18.0 is original YANMAR product. 24311-000180 O-RING, 1AP18.05 is commonly used in transmissions/axles/engines 2TNE68C-ENP, 2TNE68C-ENP, 2TNE68C-ETR, 2TNE68C-KG2, 2TNE68C-KG2, . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849