The rear wheel drive D platform was a body on frame chassis used only by Imperial from 1957 until 1966, (although Chrysler would not use such nomenclature until 1964). The standard chassis had a 129.0" wheelbase and the extended wheelbase (limousine) chassis had a wheelbase of 149.5". The D Platform had no major components in common with any other Chrysler product and consequently maintained noticeably wider shoulder room and different exterior styling from contemporaneous Chrysler C platforms.