The Bolt,hex., 6x16 is the cheapest item from this partsfiche.
Parts such as the Front Fender: Washer,plain,8mm, Fender,front, Grommt,wire, Bolt,hex., 6x16 are included in the Cb350k4 France Front Fender parts fiche.
In this schematic the "Rubber,cushion" is used most often.
