To discover exactly which parts you require use the on-line schematic exploded diagram - it will even give you some idea of where and how to fit those new parts.
CB600F HORNET 1998 (W) FRANCE CMF KPH section with twenty-two Engine, thirty-three Frame, twenty-two Other schematic pages.
This parts-list page (CAMSHAFT/VALVE) contains the most products with seventy-nine listed parts.