Rear end Help... Brakes

[67Mach1]

I have a 5 lug rear end from a 1/2 ton 1971 chevy truck that when I purchased it I was told was a complete rear end.

Unfortunatly I puled the drums the other day and all the brake mechanisims are missing from the rear end. Well almost everything... the wheel cylinders are stillthere as well as the e- brake lines.

Is there a doner truck where I can get the missing brackets, I am sure I will use a new spring kit but from what donor or what parts store can I get the adjuster and the other items that dont come with these kits. Will the parts from a 73-87 truck fit the axle?

Thanks