The Lotus Elan S3 & S4 convertible. As with the fixed head Type 36, the 1965 Type 45 was an attempt to refine the Elan, aiming the car at a higher market place. The car had the 1558cc Lotus Ford Twin cam engine. The 1968 - 1973 S4 had squared-off wheel arches, larger rear light units, a bonnet bulge for the carburettors and revised dash board (with rocker switches).