Constructed of high quality aluminum Brothers custom aluminum tanks are awesome!!! Our tanks have all been pressure tested to assure you that they meet your toughest safety standards. Tanks can be used with most popular gauges and sending units. All tanks are designed to fit under the rear of the bed and are available in top fill or side fill styles. Note you must notch the frame for side fill tanks. 19-1/4" Length, 27-3/4" Width, 10" Height.