The twenty-five Nss250s 2008 (8) European Direct Sales / Std Right Crankcase Cover/wat Er Pump component parts are all listed in this schematic.
Of all the components that make up this Right Crankcase Cover/wat Er Pump the Washer Seal, 6mm has the lowest price.
In this schematic the "Bolt,flange,nshf," is used most often.