New Wheels for my 2011 Z4/E89

Im thinking about getting some new wheels for my car. I found some in the link below and they say "Z4" in the listing of vehicles they fit but I seem to remember the front tires being a different size than the rear tires. Would this mean two different wheel sizes? I know little about mechanics of my car but I love it. Can someone tell me if this would work?

Scroll down towards bottom to see large picture and details...

http://www.ioffer.com/i/17-5x120-wheels ... -520440586

Also, since i have stock run-flats on the car could i take them off my current wheels and use them on the new wheels? I hear all these horror stories about run flats and trying to remove them and put them back on, how that is a big messy task etc..

Thanks for any info in advance,

Tommy
 
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