I have it on my Carbon Steel Grey GTI. The piece is a plastic black notch. Because CSG is already kind of dark and the notch isnt' that big, I didn't worry about painting it. I left it black. There is no gap actually. It's a pretty good fitment and uses supplied super glue with a lip that it has to be glued to the underside of the hood.
Pro Tip if you decide to get this and use the supplied notch. Rest a towel on the top of the grille because the super glue has a tendency to drip and if it does and lands on the grille, it's fuked, ask me how I know. With the towel down and the notch glued, I would let it sit for an hourif possible until it's definitely all dried up and there is no potential for drip residue.