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You could fit them w/the right offset or spacer combo - but getting them to clear the control arm is going to cause them to poke out about 24mm beyond stock which will look stupid. not to mention you'll run the risk of bottoming out on your fenders depending on your ride height
BluOOr6 is right about the control arm. Many people who push to do 21's or 22's end up having to modify the body and suspension, and then at that point you are risking the function of the car. There is a difference between reality and functionality. Set your car up with the right application and you will enjoy the looks and performance.
10.5x20" wheels will not fit the front of a CLS550, you could maybe do this if you were running some sort of widebody kit, but even then you would be fitting the wrong tire combination...ideal set up is 8.5 or 9.0 front max. For the rear you can push to an 11.0 or the 10.5.
Thanks for the info guys. I ended up running 20x9" (front) and 20x10.5" in the rear with 245/35/20 (front) and 285/30/20 (rear) tires.
I was told by some peeps at Vossen that I would have to roll the fenders, shave the bolt and actually (toe in) my camber to get the 20x 10.5" wheels to fit up front. I love the universal concave looks of the 10.5" all around but yes, I agree, not worth the headache.