Up for sale are a pair of Big Jon Trolling Systems Gimbal Mounting Bases (Part GM-46)
If your boat is fitted with 30 degree flush mount gimbal rodholders, Big Jon's "Gimbal Mounting Base" is an easy way to mount any Big Jon product that has a 4 in. x 4 in. base. The Gimbal Mounting Base simply slides into the gimbal rod holder. It is notched at the base to fit the rod holder's pin, preventing it from rotating. MRSP Price on these Gimbal Mounting Bases is $49.99 each. Buy the pair of them for $50.00