Parts such as the Second Air (gsf1200w/x E18): Bolt, Screw, Stud Bolt, Clip are included in the Gsf1200 1997 (v) (e02 E04 E22 E25 E34) / P37 Second Air (gsf1200w/x E18) parts fiche. In this schematic the "Stud Bolt" is used most often.