For bad reasons, I had the 67 parked on the street this morning, when a car slid into a third car parked behind mine. The middle car, a late model Audi A4, bowed my rear bumper and pushed the bumper guards into the rear valance. The pop-off gas cap may be damaged, but I can't tell because of the bow in the bumper. These are the obvious things. Any suggestions on what else I should be looking out for?