i just brought this 94 honda civic ex coupe, and it came with projector headlights. this is my first time with projector headlight. My question is, what size bulb do i use for the headlights? the stock headlights use one bulb which is 9003, but this projector headlight uses two bulbs, so im jus confused and i dont wanna buy the wrong hids for the car.

here is a picture of the headlights

 

You want ones that were built for HIDs if you're going to run HIDs. Putting HIDs in halogen housings makes a lot of glare instead of effectively throwing light down the road.

Most two-bulb setups are one each of a 9005 and 9006 bulb type.

You will also need to rewire or add a relay for continuous operation of the low beams. The stock single bulb system turns the low beam filament off when you switch to high. You do not want that with HIDs or a two bulb setup.