Spark Plugs Mercury Mariner RA8HC 40HP 50HP 60HP EFI Four Stroke Outboard

60HP EFI 4 cylinder models (will NOT fit carb models). 40HP EFI 4 cylinder models (will NOT fit carb models). 50HP EFI 4 cylinder models (will NOT fit carb models). These are the correct spark plugs for the following four stroke models.

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