My car is a California 66 Monza convertible. http://www.corvairkid.com/66codes.htm says: 758 is black interior Z is an exception code for no headrests Y is for Yellow exterior 2 is for black top W is tinted windshield 5Y is seat belts with front retractors http://www.gmpartswiki.com/w/Image:IhardingBodytag.jpg What is 446? Thanks, - Ian