Notes: 124770-91220 PLUG, 52 is original YANMAR product. 124770-91220 PLUG, 525 is commonly used in transmissions/axles/engines 4TNV98T-GGE, 4TNV98T-NSA, 4TNV98-GGE, 4TNV98-NSA, 3TNV76-CSAP, . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849