The second generation Ford Thunderbird (AKA Square Bird) was produced by Ford for the 1958 to 1960 model years. In response to Ford-conducted surveys two major changes were made to attract potential buyers: two rear seats were added and the level of luxury and features of a full-sized car were incorporated into a mid-size platform. As a result, sales soared and the new model dramatically expanded the personal luxury car market, winning the Motor Trend Car of the Year in 1958. Over 200,000 units were produced in its three-year model run, quadruple that of the two-seater in its three-year span. Along with the 1958 Lincolns, the 1958 Thunderbird was the first Ford Motor Company vehicle designed with unibody construction.