Ok i stole the link from the Brickyard.
Less hard work this way.
http://homepage.ntlworld.com/michaeltyler/tee3/Wheels/Wheel_Fitment_Data_file...
This will explain.
http://www.brick-yard.co.uk/forum/forum_posts.asp?TID=13832&PN=1
[ Edited on 10-8-2007 by Iwish4aSynchro ]