DAIMLER DS420 LIMOUSINE ; YEARS 1968-1992. JAGUAR Mk10 4.2 ; YEARS 1964-1968. JAGUAR 420G ; YEARS 1966-1970. JAGUAR XJ6 4.2 SERIES I, II & III ; YEARS 1968-1986. JAGUAR 420 ; YEARS 1966-1968. These core plugs are manufactured in the UK from mild steel with a silver zinc plated finish.