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Humminbird 7400771 Ms M Mount SystemProduct DescriptionMS-M, Quick disconnect mount system, MFG 740077-1, for Matrix, 300, 500, and 700 series units.From the ManufacturerThe Humminbird 7400771 MS M Mount System is an optional mount systems for your Humminbird that can also be used for a second mounting location on the boat, or can make a great repl..