In '04, they offered green paint and changed the black/silver to all black. That's pretty much it. Maybe a few minor changes like the change they made to the cable connector cover on top of the airbox in '03. One version goes on with 1 bolt and a tab stuck into a slot in the frame, the other version goes on with 2 bolts.

Let's hope there's intelligent life somewhere in space 'cause it's buggar all down here. -- Monte Python