1973 Ensign Ford-Cosworth N173 1974 Ensign Ford-Cosworth N174 1975 Ensign Ford-Cosworth N175 1976 Ensign Ford-Cosworth N176 1977 Ensign Ford-Cosworth N177 1979 Ensign Ford-Cosworth N179 1980 Ensign Ford-Cosworth N180B 1973 Ensign Ford-Cosworth N173