Here is a link to the original write-up I did on Roadfly.

http://bimmer.roadfly.com/bmw/forums/e39/5283130-1.html

The pictures are gone now but the holder is a simple bulb holder you can buy at any automotive parts store and so is the bulb...

Good luck.

__________________
Current:

E92 M3 - Alpine White / Fox Red

Retired:
2007 650i Barbera Red
2007 750i Jet Black
2006 M5 Carbon Black
2002 X5 4.4i Steel Gray / Black
2002 M3 SMG Carbon Black
1997 BMW 540i Aspen Silver
2000 BMW 528i Jet Black
1997 Range Rover HSE
1994 Porsche 968