twenty-six components are shown in this Rm250 2003 (k3) Usa (e03) Rear Master Cylinder (model K3) exploded diagram.
The Pin is the cheapest item from this partsfiche.
A sample from the products for the Rear Master Cylinder (model K3) include: Nut, Diaphragm, Washer(10x15x1.5), Hose.