Notes: 129001-01250 PLUG, 50 is original YANMAR product. 129001-01250 PLUG, 505 is commonly used in transmissions/axles/engines 3TNE78A-BME, 3TNE78A-EMG, 3TNE82A-DGD, 3TNE82A-ECB, 3TNE82A-EPM, . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849