ROLLS-ROYCE AND BENTLEY
http://rrtechnical.info/
https://rroc.hoop.la (registration required)
GENERAL MOTORS
https://www.cadillacforums.com
https://www.turbobuicks.com
https://gbodyforum.com
https://caddyinfo.ipbhost.com
http://forums.cadillaclasalleclub.org
http://gmpartswiki.com