Yes, it's a link to an '84 rotor on rock auto. They're about $35 ea. There are several brands available from them.

Cop rims will fit. I ran those before switching to the 'Doba wheels.

$55 drum to drum? Cool score! What's it out of? C-bodies and B-body WAGONS share the same width axle as a truck, just need new pads welded on. A '76 PU I had I swapped in a 9 1/4 from a ' 77 C-body.