The lowest price component in this Front Brake Caliper parts-list fiche is the Nut, Flange, 8mm.
In this schematic the "Seal Set,piston" is used most often.
Parts such as the Front Brake Caliper: Bolt,flange Dr 8x, Piston, Pad Set,fr (nas), Plate,hanger Pin are included in the Nsr125r 2000 (y) European Direct Sales Front Brake Caliper parts fiche.