On this parts fiche the Washer,sealing,6. is the most specified component.
The most reasonably priced component used on the Cb600fa Hornet 2009 (9) France / Abs Cmf Gasket Kit A is the Washer,seal.10mm.
A sample from the products for the Gasket Kit A include: Gasket,plug Hole (nas), Washer,sealing,6., Wash,sealing,6mm, Gasket,ex.pipe (nas).