In Reply to: Re: I Need 1 M5 Center Cap posted by Ben on April 04, 2002 at 13:35:26:
It's 6 5/8" across, the part no. is 3613-2226325.2 If you have one you'll know it, the roundel is spring loaded. I'd certainly appreciate any help in finding one, My understanding is the cap fits the "turbine"(which I have) and the "throwing star", please correct me if I'm wrong.
The center caps for the 89-92 "turbine" wheels and the 93- "throwing stars" are different. I'm not sure what that part number is for. I would try Beckers or Bavauto. I believe the center for the "throwing stars" is roughly $25.
The "spring loaded roundel" description makes me think you are talking about the "turbine" rims though.
Take a look at the wheel FAQs: