Parts such as the Air Cleaner / Step Bar: Bolt,hex 8x16, Spg-washer 8mm, Rubber A,step, Wire,support are included in the Qa50 1973 K1 Usa Air Cleaner / Step Bar parts fiche.
In this schematic the "Bolt,hex 8x16" is used most often.
The fourteen Qa50 1973 K1 Usa Air Cleaner / Step Bar component parts are all listed in this schematic.