Find out what the offset and width is of your current wheels.
Plug that info into this calculator, along with the new offset and width, and you will find out what the differences are, and then you can measure for yourself..
http://www.1010tires.com/wheeloffsetcalculator.asp

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Thank You!
Fred
2009 ML350
2004 SL600
2004 SL500
1996 SL600
2002 SLK32
2005 CLK320 cabrio
2003 ML350
1997 C280 Sport