This all new tank is great! Fits 1955-1959 trucks and makes the popular conversion of mounting the tank under the bed a snap! Designed with ease of installation in mind, brothers tank mounts without the need to remove your rear frame crossmember like so many other conversions. The special mounting brackets make installing and removing the tank effortless. This is the side fill tank that will require installing a filler somewhere on the vehicle, above the top level of the tank. Brothers has seen some really great ideas on this. In the fender well, through a bedside, molded in to fender, etc. Tank holds approximately 20 gallons.