E38 HID fogs? Must be after market. Standard globe is H3. IMO don't go over wattage as that can damage the unit (excess heat). Can go with +X% light output at same (55) watt power. Also HID's do not use filiments only cathode/anode/gas setup.
Good - Fast - Cheap: Pick any two.
E23 735i; E30 318i; E32 735iL; E38 735iL; R50 Cooper; R55 Cooper Clubman.
E21 318i; E32 735iL; E34 535i; E38 730iL; E53 4.4i