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On the sport you can get a 275/60R15 with 10 inch rim under the rear, but you may have to roll the fender lip some. If it's a mostly street car I would run a 255/60R15 on an 8 inch rim.
Just be sure to measure for proper backspacing on your new rims. You can use your current set up to measure the backspace and see how much further back you can go. I'll post a link below for you
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