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These specially designed mounting plates match the BBT Stack Shelf hole pattern so the conversion plate will mount directly to a BBT Stack Bow Mount, making mounting options much better suited for the large monitors to match up to your preferred combination of graphs . You should have one of the BBT Stack mounts now on your Boat.
One of these Plates are REQUIRED for your Larger Monitors, Garmin Enclosure to mount properly.
You will need to order the correct Boat Brand Dual or Triple Bow Mount if you don't already have one.

