brake issue on 68 Electra (sorry I'm a Buick noob)

I believe the rear drums can be sourced.
There are several places, but One place you can check out for brake parts is Kanter Auto Products.
They are who I'm going buy a brake kit from for the Riviera
later this winter.
http://www.kanter.com/

 

I adjusted the front brakes and it seemed to make a decent difference. If you look at the shoes you can see they were making most of their contact on the outer 1/4th of the sides. Each drum looked good to my eyes no ridges hot spots or unevenness and appear to have around 1/4 inch of steel left. The driver side adjuster seemed to be ok after running in n out a few times by hand but on thesenger side one the adjustrr is not making contact with that lever because i believe the rod at the top is a touch too long.