Wilwood Master Cylinder, Aluminum Tandem Chamber, Disc Brake Conversion 1.125" Bore Standard Included master cylinder fittings. (1) tube adapter, 1/2-20 X 9/16-18 IF, P/N 220-8575, one (1) tube adapter, 1/2-20 X 1/2-20 IF, P/N 220-8574 and two (2) tube adapters 1/2-20 X 3/8-24 IF. Fabrication or modification of the pedal and push rod may be required on the 1" or 1-1/8" bore size to adapt the master cylinder to some applications