Parts such as the Exhaust Valve: Oil Seal 9x18x7, Washer,6x12.5x2, Shaft,flap Valve, Bolt,socket,6x16 are included in the Nsr125r 1998 (w) England Exhaust Valve parts fiche.
The Bolt,socket,6x16 is the cheapest item from this partsfiche.
With two applications this Bolt,socket,6x16 is the most specified part.