As previously mentioned, you can easily run 12 mm spacers on the front and 15 mm spacers on the back. I have attached afew pic's of my car with the exact same set up as you with the 12 and 15 mm spacers. As you can see it gets you allot closer to flush but still you could go slighter further on the backs if desired.
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2016 340Xi M-Sport Sedan | BMW M Performance Exhaust l APEX SM-10 Wheels
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