The component with the lowest price in the HANDLEBAR / TOP BRIDGE schematic is the Washer,plain,12mm.
On this parts fiche the Cap,soc.bolt 8mm is the most specified component.
Parts such as the Handlebar / Top Bridge: Socket Bolt,10x32, Holder,handle Up, Bolt,socket,8x32, Holder,handle Low are included in the Gl1500ct Valkyrie Tourer 1999 (x) Usa California Handlebar / Top Bridge parts fiche.