For 400 E, with the stock alloy 15X6.5 rims, the clearance between rims and calipers is only 2-3 mm.
Since the size of 15X6.5 is for the outside portion that contact with tires, I worry even slight thickness/structure difference of different rims may cause trouble, if the rims extend more than 2-3 mm inwards towards the carlipers....
99 BMW 540i 6-speed 110K Km
03 SAAB 9-5 wagon 80K Km
92 400E (Sold) 245K km
Still missing the days with the Benz, it kept me busy.