No it is a perfectly fitted inserted grey cover that is contoured to the roof of the cab that hides where the slot is on a standard Splatter...exactly the same as the T'nA D10 dummy Dodge car. In fact all one would need is a dummy Dodge car, and to swap out the front hook chassis, remove that special plastic slot cover, and add them to a Splatter shell, and you would have a real Splatter dummy car.
Play nice & have fun!!