Some items from this specific schematic: Bolt(10x25), Bracket,helmet Lock, Grip,frame Handle,r, Screw(6x14).
The most reasonably priced component used on the Vzr1800 Boulevard M109r 2007 (k7) California (e33) Frame Handle Grip (model K6/k7 is the Screw(6x14).
On this parts fiche the Bolt(10x25) is the most specified component.