In Reply to: Try this site........ posted by Bob Hazelwood on July 05, 2000 at 10:03:20:
I used this post as a reference myself. If you live in the Chicago area, I'd recommend going to Abt Electronics in Morton Grove. I have a 2000 528 with the standard stereo and had two amps, a cd changer, equalizer, subwoofer, and two pair of MB Quart speakers installed. It turned out better than I had hoped, and the installation was outstanding. The steering wheels controls still work, as well as the rest of the console controls. Good luck on your upgrade.