Notes: 121254-77780 SCREW 5 is original YANMAR product. 121254-77780 SCREW 55 is commonly used in transmissions/axles/engines 4TNV98-YTBL, 4TNE98-TBL, 4TNE98-TB, 4TNV98-YTBL2, 4TNE98-TBL, . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849