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Our large selection of cylindrical and rectangular aftermarket Freightliner Fuel Tanks come in 19 inch, 23 inch and 25 inch diameters, up to 86 inch length and 150 gallon capacity. Choose between steel and aluminum tank steps and top off your new tank with a protective cover in a variety of colors. Aftermarket Freightliner senders, pickup and return tubes, fittings and splitters are also available.