The BOI Bridge Mount fits perfectly over your trolling motor pedal tray.  They are built with 1/4" aluminum and are predrilled for all Lowrance, Humminbirds and Garmin graphs 7" and up.  Pair this product with the Beast Outdoor Innovations Double Stack Adaptor for the best option to mount two graphs! All Beast Outdoor Innovations are 100% sourced and built in the USA.