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On my X sedan, what you have for the back would stick out ~ 6-8mm. Maybe a bit more. I'm running 245/40s 19X8.5 offset +23. For the front I'm the same except for offset +28 so you should be fine. And this is what they look like:
Sean
Wheel width also plays a part on offset, as a wider wheel may not fit the same as a narrower wheel with the same offset.