As far as i know the only way to have the fibreglass fenders on the car is if they have an engineering certificate to state that they meet crash standards ie not to weak, will not splinter and have crumple zones in place, sorry to bear the bad news, however there would be no way to tell if these crumple zones are in place as well as under guard supports if all the plastic under guards are bolted in place, but they may request the certificate.