These should be obvious:
http://www.imcdb.org/vehicles_make-Mercdes-Benz.html
http://www.imcdb.org/vehicles_make-Cadillac+Sedan+DeVille.html

Is there a discussion on companies that are arguably tuners (Brabus, Masonry, Gemballa) being included as manufacturers? I thought I saw one, but I can't remember what thread it was in.