I have a 86 sport coupe that i dont ever had the valances ever on it. if you dont know what im talking about looks like she skirts that go the whole way around the car.my car already has a 89 z28 front bumper and spoiler cuz guy that had car before me hit a deer doing eighty. anyways how are the valances mounted to the car mine did not come with it from the factory im assuming the 91-92 z28 ground effects package would mount on the same way cuz thats really what i want.