Some items from this specific schematic: Rod-assy-brake, Hose-brake,rr M/cylin, Bolt,socket,8x30, Cap-brake, Rr.
On this parts fiche the Washer-seal,10.1x14.5 is the most specified component.
Of all the components that make up this Rear Master Cylinder the Pin-cotter,2.0x15 has the lowest price.