The component with the lowest price in the CRANKCASE schematic is the Gasket(5.8x11x1.2) (nas).
On this parts fiche the Bolt is the most specified component.
Parts such as the Crankcase: Nut, Gasket(12.1x16.2x3.7) (nas), Bolt, O Ring(d:1.2,id:4) are included in the Ls650p 1999 (x) (e02 E04 E17 E18 E22 E25 E53 / P37 Crankcase parts fiche.