The serial number tag is found over the SWIVEL BRACKET (port or starboard); or, check the INSTRUCTION PLATE, located in between the thumb screws above the steering tube. The good news is, PartsVu has a prosperity of resources to assist you find the Mercury outboard parts you need to keep https://connerximoq.theobloggers.com/43272112/the-basic-principles-of-marine-outboards-for-sale