Here is a bare metal steel fuel tank made by SHIFTUP (Japan), the tank is designed to fit Honda Z50J and designed to look like the old style Z50J1 shape of tank. There are 2 positions in which the fuel tap can be fitted to help with clearance of custom carburettors. The bigger hole you see at the bottom of the tank is to fit a optional Honda made electronic fuel gauge sensor (not included). The fuel sensor hole does not need to be used, a bolt and washer is supplied in the accessory kit to cover this.
The tank has been soaked in oil and sealed to protect against corrosion, so please keep this in mind when unpacking the tank.