Double Six III (1972–1973)Double Six III (1972–1973) Double Six IV (1973–1979)Double Six IV (1973–1979) Double Six V (1979–1992)Double Six V (1979–1992) Double Six VI (1993–1994)Double Six VI (1993–1994) Double Six VII (1994–1997)Double Six VII (1994–1997) Six X300 (1994–1997)Six X300 (1994–1997) Six XJ40 (1986–1994)Six XJ40 (1986–1994) Sovereign I (1969–1973)Sovereign I (1969–1973) Sovereign II (1973–1979)Sovereign II (1973–1979) Sovereign III (1979–1987)Sovereign III (1979–1987)