The Front Brake Caliper is made up of components including this Caliper Assy (left) which is the most expensive.
In this schematic the "Bolt" is used most often.
Parts such as the Front Brake Caliper: Brake Pad Kit (nas), Disc Brake Assy (front), Pin, Pad, Support, Pad are included in the Xt660r 2005 5vk4 Czech Republic 1d5vk-300g2 Front Brake Caliper parts fiche.