I suggest you get the whole wheels so you can put them on the X. Now memorize the note that QSilver7 gives you above.
Here is style87 info so you can find wheels that are as close to it as possible:
Front: 20x9.5 ET45 (<--offset)
Rear: 20x10.5 ET30

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00 E39 DINAN S1 //M5 (82k miles)
06 E53 DINAN 4.8iS, born 2/18/2006 (126k miles) http://www.xoutpost.com/bmw-sav-foru...s-my-dslr.html
90 Straman Z32 TwinTurbo Convertible, (1 of 44 ever made) 5 speed, 444rwhp/451rwtq
01 360 Novitec Spider F1 (26k miles)