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You face a few decisions going to the larger wheels.
1. Are you going to run the same staggered offsets and different wheel widths/tire sizes as come on the AMG’s? That would be the easiest fitments that keep the Odometer accurate but you are stuck with few tire choices and can’t rotate.
2. Next would be to run the same wheel front and back but the rear wheel runs less offset so you won’t be stock but might be OK. More tire choices and can rotate tires. I would use the OEM front size.
3. You can use a tire comparison tool to try different than OEM tires and get close to the same circumference or at least minimize the difference.
Tire/wheel comparison-http://www.rimsntires.com/specspro.jsp
Personally, I like a little bling and dislike all black wheels. Here’s what mine look like with the Continental Cross Contact AS tire. (A great tire to my surprise) Here are my 21’s that come with the Night Pkg.-I changed the center caps to match my Cardinal Red.