In some judgings you don't get dinged, but I believe there are bonus points available for certain wear and assembly line only items like this. So now instead of 5000 points for a "perfect" car, you can get 5000+ points. So, in a way you get dinged I suppose. Another example is assembly line AC spark plugs only had a single, thin green ring where replacements had 4 thin rings. I call these "lunchbox" parts as the only way to get them was when they went out the assembly plants door in somebody's lunchbox. Legends judges correct me if I am wrong here.
http://www.1970z28camaro.com/engine/0142.jpg