I have the same exact rims. They arrived at my house last week. When I first saw it on the internet, it looked more black than it did gun metal. I was hoping it was more black because my car is yellow but then I saw it in person and it's a dark gray color. Just put it this way. If you're driving during the day, it will look dark gray. During the night it will look black. either way these rims look hot. I hope this helps. I'll post up some pics tomorrow.
Oh yeah, about the lug pattern. The salesman should ask what kind of car you have. They might have it they might not. Wheelsnext carry these rims. Thats where I got mines. Lets just hopin I didn't take the last set.