I made some cleat mounts up out of 1-1/4" box iron with a rectangle plate welded to the top that scotty surface mounts bolted to, cut a slot out of the bottom of the box iron and drill a hole through the side with a clevis pin, slide the box iron slot over the cleat and pinned the back side. worked great, c channel or u channel would have worked too with one clevis pin in the side through the middle of the cleat hole, if you can weld or have a buddy who can weld its pretty simple design the pics are before i weld the plate ontop for the scotty mounts to bolt to