DOES N E ONE KNOW IF OETTINGER AND ABT REAR SKIRTS ARE LIKE URATHANE OR FIBERGLASS? CAUSE SOMEONE HIT ME IN THE BACK ...AND I M JUST GOING TO PUT A AFTERMARKET ONE ON THE BACK...SO IT FLOWS... CASUE I GOT THE ULTRA SPORT PACKAGE SO IT ALREADY HAS A FRONT BUMPER AND SIDE SKIRTS.