There is a light bulb behind the reflector on the side which is the turn signal. The outside one in the front is a parking light. You will not be able to use the stock bulbs. The ones I have use H1 and H3 bulbs. The Halos will need to be wired to the parking light. I connected the Halos to that one, and left it unplugged from the outside light, so that when I turn on my parking lights, it turns on the side turn signal, and the Halos. The bumper will need to come off and is not fun at all. Find out from the seller if that one brings the bulbs with it, it should. You will also want to seal them before installing them. I suggest doing more research on them before you purchase.