The serial number tag is found to the SWIVEL BRACKET (port or starboard); or, check the INSTRUCTION PLATE, Situated concerning the thumb screws above the steering tube. Fortunately, PartsVu contains a wealth of resources to help you find the Mercury outboard parts you need to maintain your engine running smoothly, https://ricardonsusq.suomiblog.com/the-smart-trick-of-us-motors-official-website-that-no-one-is-discussing-52157519