Check out any of the two Seat Cowl *r157* components enlisted.
On this parts fiche the Washer,plain,4mm is the most specified component.
Parts such as the Seat Cowl *r157*: Washer,plain,4mm, Seat Cowl Italian Re are included in the Cbr600rr 2008 (8) Mexico Seat Cowl *r157* parts fiche.