I am also in need of rear shoes I believe. Will remove the drums on sunday.
I just sent a mail to alretta truck parts, and asked if they can supply the parts needed. I already bought a new MC and a reman brake booster from them.
I had my car checked at test station and had almost NO brake on right rear, left rear and all front is working 100% fine.
I suspect cleaning and grasing can do the trick, but am afraid the shoes are done.
I will reply here what Geoffrey replies about the shoes and wheelcyls. /Ulf