Hi I stupidly reversed into a post and left a dent in the rear bumper, it isn't too bad, just a mild depression in the plastic, the paint hasn't cracked. Can these things be filled then resprayed or is it a whole new bumper job? It is a star silver Astra 2003 model, what is the approximate cost of a new rear bumper these days or if repairable what that might cost? Before I start hitting the dealers for a price it is nice to know an approx figure I should expect. Regards Philip