Right Richh here goes.
I have found a B swinging arm with spindle but no end caps or nut. I’m sure they would be quite easily sorted.
I also have rear master cylinder with rod, rear caliper on bracket complete with spacer and nut and a rear brake lever. Do you need the hose and caliper stay too?
They will all need a refurb but i’m guessing you will be doing that as a matter of course.