its the same as the side blinkers on the each side of the x5 above the 3.0 or 4.4 emblem...i believe it is a T10 with ebay search but it is actually a 194 bulb. I used white LEDs in my interior.

http://cgi.ebay.com/ebaymotors/2-Bulbs-S-Blue-T10-6-Led-194-168-158-Side-Lights-12v_W0QQcmdZViewItemQQcategoryZ33713QQihZ009QQitem Z190109683711QQtcZphoto

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'04 BMW X5 3.0i TitanSilber Metallic
'03 Lexus GX470 Black Onyx
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'03 BMW X5 3.0i Black Sapphire SOLD