These aluminum fuel tanks are designed to fit between the frame rail and rearward of the axle on 1955-59 Chevy/GMC trucks. By moving the tank out of the cab, you gain much needed room to allow for further customization, increases fuel capacity and safety! Made of heavy gauge aluminum, these tanks offer a light weight. Available in side or bed fill, please specify. Note: Fleetside trucks require modification if installing bed fill type. Tanks width measures 28" wide.