One new Kingsborne brand clutch alignment tool (made in the USA), part number CA21, 73-00528, 387-260, 066-8021. This is a 10 x 1 1/8" spline unit and fits:
Jaguar XKE 3.8L & 4.2L 1961
Jaguar MKI 1955 - 1960
Jaguar MKII 1957 - 1965
Jaguar MKVII 1950 - 1957
Jaguar MKIX 1958 - 1961
Jaguar MKX 1965 - 1966
Jaguar XJS 1975 - 1979
Jaguar MKVIII 1956 - 1959