One new CEW brand transmission front oil seal (made in England), part number WR72, 1417-020, 60215, 520-060.  This fits:

Triumph TR2 1953 - 1955
Triumph TR3 1955 - 1957
Triumph TR3A 1957 - 1962
Triumph TR3B 1962
Triumph TR4 1961 - 1965
Triumph TR4A 1965 - 1967
Triumph TR250 1968
Triumph TR6 1969 - 1974
Triumph Stag with standard transmission 1970 - 1973
Triumph TR 2000 1964 - 1967