I tried to do my corners black housing before i did my headlights...they didnt turn out as well as i wanted. what i did to get them apart was take a dremel, and cut all the way around, which unforunatly made a frosted look all around the edges. I also accidently used grille paint, so its a not at all glossy.
When I finally get a chance, Im going to do the headlights, and try to save those corners. Im not sure if I shoulda just did a strip around the outside, or the whole things. Im also doing the wheels in a dark gunmetal. But the coners do look really tight when you are in front, they just look like **** up close.