best bet is to pull out the old lock cylinder and get a new one. can get one off of ebay here
starting bid is 5 bucks and there are no other bids right now. to replace the cylinder, u'll have to unbolt the bottom cover beneath the seaing wheel. then insert the rest of the key into the ignition and turn it to the acc position and push a pen or small screwdriver or something into the lock pin that holds the cylinder in place, the pin is on the bottom side of the cylinder, then it should slide out. to install the new one, put the new key in the new cylinder, turn it to acc, then slide it into the hole, pushing the lock pin up slightly and ur set. don't forget to swap off the little plastic ring around the cylinder to fill in the space around it.