I believe that all X5s up through 2003 use the H11 fog bulb I just these LED bulbs they looked wicked and do not throw off any heat even though they are rated at 100 watts but only draw 1.5 watts:
IPF LED X Bulb: Superwhite 9006
Bulb Type:
9006 Sold As: Twin Pack [Pair]
Wattage [draw]: 1.5
Wattage [output]: 100
Color: SuperwhiteColor
Temp: 4800K
Warranty: 90 Days
IPF Super Light Emitting Diode bulbs are the newest thing on the market. With only a 1.5 watt draw the LED technology allows for a bright light with none of the heat. IPF LED bulbs are manufactured to match perfectly with OEM HID headlights when used in fog lights. IPF LED bulbs are manufactured with top quality materials, and feature a 90 day warranty. Made in Japan.
http://www.automotivelightingusa.com...6ea0b6b31a823a