The serial number tag is situated on the SWIVEL BRACKET (port or starboard); or, check the INSTRUCTION PLATE, Found involving the thumb screws above the steering tube. Fortunately, PartsVu provides a prosperity of resources to assist you find the Mercury outboard parts you need to keep your engine running easily, https://eduardobsnzx.blogdigy.com/the-outboard-motor-size-for-boat-diaries-56447595