I have a Fidanza lightweight aluminum flywheel that fits any e36 for sale on Ebay that was only installed once but never used.
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&ih=020&sspagename=STRK%3AME SE%3AIT&viewitem=&item=300209956821&rd=1
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&ih=020&sspagename=STRK%3AME SE%3AIT&viewitem=&item=300209956821&rd=1