1977 Mercedes-Benz 450SL Convertible/Hardtop Classic Luxury with Exceptional Mechanical Updates. 4.5-liter V8 engine, automatic transmission. This 450SL includes a fully operational soft convertible top for open-air cruising and a removable hardtop. The R107 series is one of Mercedes-Benz’s most iconic and enduring models! The paintwork, trim, and interior show signs of age and will require attention to return to their original glory.