I have a 1973 corvette I just started working on which is wrecked in the front! And the extension bar is bent so I want to replace it.I have two questions!1. I've seen sever two types of front bumper extension bars! One with a impact bar and one without! 2. I've noticed there are two styles of fiberglass bumpers people put on the cars and two different types come up when you search for the part! One has a middle grill one has a license plate center.I don't know if this car was all original but it had a extension bar without a impact bar and the fiberglass bumper with the license plate centernow I may be wrong is the impact bar for the style with the center grill? Or both should have one?