My roommate drives a 350z and recently got a set of wheels that look very similar to my SRT rims. They have a slightly more aggressive look because the lugs are exposed. I really like the look of this, as a few other forum members ride without the caps, but I cannot stand the empty hole in the middle of the wheel. Is there anything I could buy that would fill this hole? Surely there is something that would look decent.

 

There are M.B. center caps that fit. I'm not sure of the part number anymore though.

 

Go to home depot, get knockout plugs that are an 1.25 or 1.50 wide, I forget exactly, so you will have to test it. There are edges on the back of the plug, bend them the opposite way and put them into the hole of the wheel. I plasti dipped mine when I plasti dipped my wheels so they look good. They have never fallen out in the 6 months they have been on the car.