It's a 9005 for the high beam, and a H7 for the low beam.
When you pull the H7 bulb out, it will be mounted to a gray adapter plug. Simply pull the two halves apart.
Also, make sure you dont go above 65W for either bulbs. I have heard stories of people going to 100W and melting the headlamp cover and wiring harnesses.
I put Xenon Super Plasma Bulbs from EuroLite in mine. The low beam definitely looks better, but the high beam seems out of focus and not as bright as stock.
Mike