happened to mine. used coat hangers at the corners - thread through between the bumper and the rubber, around the bumper to conveniently placed holes attached to the body. does the job and does not look too bad until can find some type of super glue to use on the inside or some other method (drilling though bumper so to bolt onto the bumper mounting struts??)
realize the above jury rig is not the greatest but at least am confident i won't see the whole bumper falling off on the highway behind me