Check out any of the twenty-one Front Brake-caliper components enlisted.
In this schematic the "Bolt (3h5)" is used most often.
Parts such as the Front Brake-caliper: Seal Kit, Bolt (3h5), Disc, Brake, Pin, Cotter (648) are included in the Xv920 Virago 1982 (c) Usa Front Brake-caliper parts fiche.