The Bolt(6x20) is the most widely applied product in the GSXR1000 2004 (K4) USA (E03) OIL COOLER ( four times ).
fourteen components are shown in this Gsxr1000 2004 (k4) Usa (e03) Oil Cooler exploded diagram.
The component with the lowest price in the OIL COOLER schematic is the Spacer(6.5x10x10).