Do what I did to an old mk1 which I had BBS kit on - cut the front side parts of the kit and fibre glass new sides to smooth off into the side panels - takes a while to get the shape, but with fibre glass, time and effort you can get it looking good. Best to make up templates first of what u want the bumper to look like on the car then start cutting the bumper and fibre glassing.
Just fixed one of my clipper arch's using fibre glass - no one will even know it was broken. Love fibre glass -
