The hub diameter will be your biggest hurdle as andrewwynn mentioned above. The tire diameter is probably not the issue but the E70 has that front shock mount that fouls on some tires which means spacers, again, as mentioned above. The best, cheapest, simplest tire wheel setup I've come across is the Style 209 or 210 wheel and 255/55R18XL tires. Not fancy or cool but gets it done.

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8/2011 X5 xDrive35d Sport, Black Sapphire Metallic, Black Nevada Leather, Fine Burr Walnut Trim
2/2001 M5, Jet Black, Exclusive Complete Black Walk Nappa Point Heritage Leather, Black Cubic Trim