Jeep CJ 21 Gas Tank 1978-1986 &ndash; 0051XL Extra Capacity for those long trail rides MTS replacement tanks are molded in one piece and have no welds or seams to split apart and will never rust through. Made of High Density Cross Linking Polyethylene, a high strength material with superior puncture resistance. Will not crack even at 160 degrees below zero. Made in the USA