The 19-184 fuel system kit is designed for the 1963-66 Chevy/GMC trucks. This fuel tank mounts under the truck bed using the flanges to bolt in place. The tank is designed to bolt up to the bottom side of the frame rails but it can be mounted in different configurations including on top or even in-between the rails in some cases. It is up to the installer to drill and locate the mounting holes. Mounting hardware is not included. The fuel filler neck will go up through the bed floor. You can purchase the optional 19-186 Side Fill Kit to mount fuel filler on the bedside. The kit includes the tank, a 255 lph fuel pump, internal baffling, and a fuel level sender. The tank is powder coated for corrosion resistance and great looks. 18 gallon capacity Supports up to 550 EFI (@ 60 PSI at 13.5 Volts / 10.4 AMP Draw) Size is 32-1/4″ x 20-1/2″ x 9-3/4″ (including the mounting flange) Size is 28″ x 20-1/2″ x 9-3/4″ (measured without the mounting flange)