Sorry to hear about this--but it happens to all of us sooner or later.
If your handlebars came around and bent your airbox cover, then you'll also be needing a new lower triple clamp. The turn limiter peg (on the lower triple clamp) will have broken off allowing the bars to turn far enough to hit the airbox cover.
I've already replaced all the parts but I'm looking for another stock air box cover because the one that on it is off a 04-B (Black) I still have the old one it has a small dent in it from the turn signal. Would trade as a core for the stock if someone was wanting one for paint.