Parts such as the Front Caliper (model K2/k3/k4): Piston Set, Shim,pad, Bolt(8x32), Bolt(8x48) are included in the Rm85 2004 (k4) Usa (e03) Front Caliper (model K2/k3/k4) parts fiche.
The lowest price component in this Front Caliper (model K2/k3/k4) parts-list fiche is the Bolt(8x32).