Whos running 275/60r15. Having issues

So I had done a lot of research and kept coming up that a p275/60R15s fit on a stock Duster on 15x8 rims with 4.5 backspace. So I bit the bullet and purchased a set for a rear end I'm swapping into my Duster. This rear came out of a 74 factory 318 Duster. When I mounted the Wheels to the rear for a test fit one side rubs bad and the other is super close. Did I miss something on the specs?
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