I just did this. The servo may be an issue. The O rings were a piece of cake. You will have to remove the side pannel on the center console. The passenger side only. You will drill a small hole on the inside of this piece. This will enable you to remove the screw holding the vent in place. You will then need to remove the glovebox lock and use about three extensions and loosen the bracket holding the heater matrix pipes in place. You can then replace the O rings. There is a good description on the web for all of this.
Joe
