You can go to
http://www.sylvania.com/ConsumerProd...de/default.htm
It list every lamp on virtually every car on the road.
It lists the 9003 *IF* your car uses capsules, or H4666 if your car uses sealed beam lamps.
If your car uses capsules, you can buy higher power xenon lamps on eBay. Pull one of your capsules, and read the wattage off the base
Technically, they are illegal. But since HID lamps put out 3X the light of a halogen, I doubt anyone is going to stop you for it.
If you go to Walmart, you can pick up a set of Sylvania SilverStar standard wattage lamps that are noticibly brighter and whiter than standard halogen capsules, if you are worried about the extra current draw from high output (higher wattage) xenon lamps from eBay.