This rebuilt EA82 [with no history of who did the work or when it was done] turned out to be ok. I found it on Craigslist. Local pickup. It was my lucky break.
160 miles on it so far. Shows to have a reliably functioning bottom end.
what he said - get the entire rear knuckle assembly and brake parts for each side. i'd get the ebrake cables too.
i don't know the exact year cross overs - you can look up caliper and knuckle part numbers on subaru parts website and click on "what this fits" and it shows you all the models applicable. or use ebay or other online place and see their listings for parts...but sometimes those are less complete or overly generous in applicability if you're not discerning.