I've already put Silverstars in mine, you have to rotate the little allen wrench looking things on top of each headlight housing, remove the housing, then replace the bulb.
These things are BRIGHT and blue/white, like BMW or Audi lights - I get flashed all the time, gotta like that. I got them at Wal-Mart for $37.62 for the pair. They're 9007 (part #) bulbs.