.75 Master Cylinder .Master Cylinder Triumph TR3 from TS13046 On, Brake or Clutch with 3/4 inch bore. Also can be used on Austin Healey BN4 to BN7 with non servo for a better pedal feel. And is can be used for the Jaguar E-Type with the Girling style clutch master but you will need to retain your original push rod. Repro .