twenty-four components are listed in the schematic for this Sbk999 2003 Eu (superbike 999) 9151-1601a 024 Front Hydraulic Brake .
The lowest price component in this 024 Front Hydraulic Brake parts-list fiche is the Copper Gasket 11.9x8.2x2.
In this schematic the "Copper Gasket 11.9x8.2x2" is used most often.