You should also ensure that the rear-wheel play is not in the bushings or the pivot rod that holds the uprights to the A-Arms. My bushings were worn, and that's where my rear-wheel play was coming from.
See the write-up on #5357 in the Specific Car Forum..... My buddy made me a set of bushings, but I believe the vendors sell them too.
You probably want to grease those bushings while you are working on your suspension, as well.
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