This REAR FENDER(1) assembly utilises two Nut,clip,4mm(s) - the highest specified component.
Check out any of the eleven Rear Fender(1) components enlisted.
The most reasonably priced component used on the Cb600f3 Hornet 2010 (a) European Direct Sales / St Rear Fender(1) is the Nut,flange,5mm.