Parts such as the Rear Master Cylinder: Cylinder Assy, Rear Master, Nut, Washer(8.5x13x1.6), Rod,push are included in the Dr800s 1995 (s) (e04 E22 E34 E37) Rear Master Cylinder parts fiche.
Of all the components that make up this Rear Master Cylinder the Pin has the lowest price.
The most expensive part in this assembly is the Cylinder Assy, Rear Master.