Maybe one of these similar products would be of interest:-
GENUINE TRIUMPH GEARBOX MAIN OIL SEAL T 1478 1957-74 T21 3TA 5TA T100S T100R
TRIUMPH GEARBOX INDEX PLUNGER SET T372 1938-67 5T TR5 6T T100 T110 TR6 T120
TRIUMPH GEARBOX LAYSHAFT NEEDLE ROLLER BEARING 57-1606
TRIUMPH 3TA 5TA T100 TRIUMPH GEARBOX MAINSHAFT HIGH GEAR BUSH 1959-73 57-1405