One new EPC brand 3/4" master cylinder repair kit (made in England), part number SP2078 or SP2132.  This fits:

Armstrong Siddeley Sapphire 01/1955 - 01/1956 (for brake master cylinder)
Nash Metropolitan 1952 - 1955 (for brake master cylinder)
Aston Martin DB4 1959 - 1965 (for clutch master cylinder)
Lamborghini Miura 01/1967 - 12/1968 (for clutch master cylinder)
Sabra Sports 1961 - 12/1967 (for brake or clutch master cylinders)
Reliant Sabre Sports 1961 - 12/1965 (for brake or clutch master cylinders)
Jensen 541 1955 - 1956 (for brake or clutch master cylinders)
A.C. Ace Sports 1955 - 1958
A.C. Aceca 1955 - 1958
A.C. Greyhound 1959 - 1961