Parts such as the Gasket Kit B: O-ring,11.9x2.2, Washer O-ring Kit, Gasket,r Cover (nas), O Ring,6x2 are included in the Cb1300 Super Four 2007 (7) England / St Gasket Kit B parts fiche.
On this parts fiche the Wash,sealing,8mm is the most specified component.
The lowest price component in this Gasket Kit B parts-list fiche is the Washer,plug Drain 14.