5 by 112 mm, weird size in the world of autos. but you can pull wheels off of any year or model and they should fit. However you can't go to wide due to the way the clearance is next to the struts and shocks. Personally I like the new SLK style. check ebay. always good deals. That's the great thing about MB's, so many parts are interchangeable. Like if you wanted bigger brakes you could pull off a 400E or 500E and "plug and play".
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