1962 and 1963 Dodge and Plymouths B bodys(1962 Dart is a B body) use the same spring, the 1963 and later A body use the spring sizes also All of the Mopar SS springs are the short front segmnet like your Dart has, unless someone has put later B body springs, hangars and rear shackles on it The front segment should be 20 inches from the center of the front spring eye to the center of the spring centering bolt