Lobster Mount Adapter for use with M3 mounts New in PackageThe adapter plate is used with the LobsterMount M3. Predominately used for FishFinders and other larger GPS units, the Adapter Plate is great for customizing the LobsterMount to hold anything of your choosing. With many holes to choose from your purpose will be met.For use with: Garmin 162, 168c, 182c, 188c, 320c Lowrance X47, X67c, M68c Eagle 128, 168, 240s Humminbird 17, 27, 37, 67, 535, 565, Piranha Max 10,20 Ray Marine DS 400, DS600x Navman Tracker 5500, Fish 4380, 4500