Plain steel clutch plate, BSA 4 spring clutch models B31, B32, B33, B44 (1958 up), A7, A10 swinging arm models (1958-62, 4 spring clutch), A50, A65 (1966-72), Triumph twin cylinder models 350, 500, 650, 750 (1939-83) 3HW, 3TA, 5TA, T90, T100, T120, T140