Check out any of the four Oil Tank components enlisted.
Parts such as the Oil Tank: Body, Cap, Screw, Binding, Oil Tank Assy, Clip 101235600 are included in the Yq50 Aerox 2001 5khb 115kh-361ea Oil Tank parts fiche.
With a quantity of two pieces, the Screw, Binding is the most used part in the OIL TANK diagram.