It is suggested to pressure test and use a tank sealer. We suggest using Kreem gas tank combo kit to clean, condition and seal to help stop leaks and prevent corrosion. Check petcock opening, making sure the petcock can be easily installed. Petcock fitting should be masked or plugged during painting for easy installation of petcock. Top Length: 19.5" Bottom Length: 19" Rear Width: 4.5" Front Width: 9.5" Rear Height: 2.5" Front Height: 8" Front Tunnel Height: 0.5" Rear Tunnel Height: 3.5" Tunnel Length: 19.5 NOTE GAS TANKS MY NEED SOME BODY WORK, ALL GAS TANKS WILL NEED TO BE PAINTED FITS.