That's true. Someone could have just extended them. Notice on the one Frank posted, and the one for sale that they are dead on. Even in the license plate area. The left is closer to the center than the right side. Usually if you free hand something like that, you'll try to even it out. That's what makes me think it's a stencil.
Maybe GM's got the answer hid with the L 89 novas, rocker curtains on 68 novas, and a lot of other stuff we just guess about.
