The Pin,spring,2x10 is the cheapest item from this partsfiche.
This Cover,m/c Res.tan is the most expensive of the items that make up this Rr. Brake Master Cylinder assembly.
Some items from this specific schematic: Clamper,master Cy, Float,rr M/c, Oil Bolt,10x22, Hose Comp,rr Brk.