 An evolution of the compact 1976-1980 Dodge Aspen/Plymouth Volaré, the M-platform vehicles matched the 1973-1977 GM A-platform vehicles closely in wheelbase and length.Supported primarily by fleet sales, the Dodge Diplomat (which replaced the Dodge St. Regis) and Plymouth Gran Fury were produced through the 1989 model year; neither model line saw a direct replacement.With the exception of the Dodge Viper and Plymouth Prowler, the 1989 M-platform vehicles were the last rear-wheel drive Chrysler cars produced until the 2005 introduction of the LX platform.