The serial number tag is found over the SWIVEL BRACKET (port or starboard); or, check the INSTRUCTION PLATE, Found in between the thumb screws above the steering tube. Luckily for us, PartsVu provides a wealth of resources that will help you find the Mercury outboard parts you need to keep https://ericknlwdn.worldblogged.com/43078752/the-basic-principles-of-marine-outboards-for-sale