Recently did this on my 530xi, thanks for the info guys!

 

I thought these had connector plugs to mate to the OEM wiring, but mine arrived with bare wire. How are you guys wiring these up?

 

I took out the plastic under door light housing, removed the bulb, drilled the hole where the bulb was, then soldered the wires to the bulb connections. Then you can just plug the housing back in and re-insert into the door. The best part is if you screw it up, it is literally the cheapest piece on a bmw to replace from the dealer, $21.99 at mine. lol

 

If I'm remembering correctly I believe I just shoved the wires into the existing plug and taped it up.

Edit: Yes, that's what I did