Oh these guys do proper HID conversion kits for standard bulbs. I'm not vouching for them as i understand legally they are in a grey area, dispite what many vendors seem to say.
I bought a set for my 1 series (E87), bit ended up returning them (unused) as the HID bulb supplied was too long for the E87 lamp housing (the reflector has a litle reflectibe "hat) in the middle of the lens), though i understand they do a shorter bulb to cope with this issue.
I also understand someone here has their kit on an X5 and a mini and they quite like it....anyone want to comment?
Gerry