Notes: 183920-91280 KEY, STARTER SWITCH is original YANMAR product. 183920-91280 KEY, STARTER SWITCH5 is commonly used in transmissions/axles/engines 6600TE5EBG1, 6600TE5EBN1, 5500E-5BG, 5500E-5EBG1, 100AEDEGYT5B, . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849