How unique are mercury engine serial numbers? Are every single one different, or the same serial number for the same engine model? My boat service shop needs the engine serial number from me so they can order some parts. If each # is not unique, anyone know the engine serial number for a 2005 sea ray 220 select with mercury 350mag MPI bravo 3? Trying to figure this out without having to head out to my winter storage unit just yet.