Check out any of the twenty-six Rear Master Cylinder (model K2/k3/k4) components enlisted.
A sample from the products for the Rear Master Cylinder (model K2/k3/k4) include: Pin(8x20), Cylinder Assy,rr Master, Washer(10x15x1.5), Diaphragm.
With four applications this Washer(10x15x1.5) is the most specified part.