OEM Mercury Quicksilver Aluminum Lower Trim Tab Anode 31640 , 31640-4, 31640Q4 Fits Alpha 1, TR, TRS Most Mercury & Mariner Outboards 35HP-200HP Oem Mercury Quicksilver Aluminum Trim Tab Anode Fits Alpha 1, TR, TRS Most Mercury & Mariner Outboards 35HP-200HP 31640, 31640Q4