Check out any of the five Eng.guard components enlisted.
The Washer,plain,8mm is the lowest priced item on this Eng.guard schematic.
Parts such as the Eng.guard: Bolt,flange,8x16, Engine Case Protecto, Washer,plain,8mm, Bolt,flange,10x25 are included in the Cb1300 Super Four 2007 (7) England / St Eng.guard parts fiche.