Notes: 183533-74380 SCREW, M4X20 is original YANMAR product. 183533-74380 SCREW, M4X205 is commonly used in transmissions/axles/engines 6600TE5EBN1, 6600TE5EBG1, 5500E-5BG, 100AEDEGYT5B, YDG6600TE-5EBN1, . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849