Thanks for the feedback. Found '97 Thunderbird rear assy complete with rotors and brakes. It's not positraction, but only has 16000 miles!! Paid $225. Rotors are right at nominal for new rotors. Should work fine.
1) Does anyone know if the rust on the rotors should be cleaned off by machining, or is there a different method?
2) This rear axle has sat outside for quite a few years so the boots will need to be replaced. Is it likely the rear end seals and brake caliper will also need replacement?
Thanks