IDMK 300 In-Dash Mounting Kit for 300 by Humminbird. for 141C, 323, 343C, 363, 383C. The In-Dash Mounting Kit provides the capability to install a unit in the dash. The same rugged construction as the unit makes for a durable and integrated installation. Ready for your next trophy catch with the latest fishing gear? Complete your arsenal with quality and dependable fishing gear that will work best for your next fishing trip. Gear up with us for the fishing trip of a lifetime!