T Built 15" Fifth Wheel to Gooseneck Adapter Hitch 15" 5th Wheel to gooseneck adapter Comes with the required hardware and has a total height of 16.5" or 14" from the top of the ball to the top of the mounting plate. Converts your fifth wheel Bolts right on to your 5th wheel plate. Keeps your bed available Uses a 2 5/16" ball