The component with the lowest price in the CRANKCASE COVER schematic is the Pin.
On this parts fiche the Bolt is the most specified component.
Parts such as the Crankcase Cover: Pin, Plug,14x12, Gasket,magneto Cover (nas), Gasket(5.8x11x1.2) (nas) are included in the Tl1000r 1999 (x) Crankcase Cover parts fiche.