Parts such as the Front Damper: Spacer,seal, O Ring(d:1.9,id:3.8), Seal,oil, Packing (nas) are included in the Gsxr750 2009 (k9) Usa (e03) Front Damper parts fiche.
The O Ring(d:1.9,id:3.8) is the cheapest item from this partsfiche.
With a quantity of four pieces, the Bolt is the most used part in the FRONT DAMPER diagram.