The Bolt,hex. Socket Button is the lowest priced item on this Front Brake schematic.
Some items from this specific schematic: Bleed Screw Kit, Bracket, Support, Bolt, Brake Pad Kit (nas).
The Ybr250 2007 5d11 Europe 1f5d1-351f1 Front Brake consists of sixteen pieces with the Caliper Assy (righ being the most expensive.