Aluminum clutch pressure plate for 4-spring clutch.
BSA A7, A10 models (1960-) with 4-spring clutch
BSA B31, B33, M20, M21, M33 models (1959-) with 4-spring clutch
Triumph pre-unit models 3T, 5T, T100, TR5, 6T, T110, TR6 and T120 etc (1950-61)
Part numbers: 42-3173, 42-3173A, 57-0986
