Check out this link from Crutchfield. This will cover the space left over by the single din radio.
http://www.crutchfield.com/S-mUfMF6R...sp?I=142BW2330

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[Sold] 2004 X5 4.4i - Sterling Gray - Truffle Brown, Sport, Preminum, Rear Climate, DSP, Sirius, PDC, 132's (19 inch wheel), Comfort Seats
Dynavin, JL Audio Stealthbox, Alpine PDX-5 Amp