21" wheels
The stock wheel in the US is an AMG Style VI, 10 x 20 ET46.
The R-Class wheel pictured is AMG Style III, 9 x 21 ET60 (front); 9 x 21 ET48 (rear).
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No Archaedus I think AMG is still constructing the GL63 AMG and I think it gets other 21" AMG Wheels you can see the pics here if you scroll down on the pricelist
http://www.mercedes-benz.de/content/..._GL_Klasse.pdf
(I'd think that different tire sizes may be required though...?)
(This is assuming that the wheel specs posted above are correct)
On the FRONT:
AMG Style III, 21x9 ET60 will have 1mm less INNER clearance, and 27mm more OUTER clearance. A 25mm spacer and extended lug bolts would get the wheel almost back to stock track width.
On the REAR:
11mm more INNER clearance, 15mm more OUTER clearance.
The only issue I can see would be the brake calipers, but since you're going up an inch you'd probably be ok. In my opinion, you'll need some serious spacers to prevent it from looking "sunk in." H&R offers a ton of options, and we carry their whole line.










