Features new 1? bore dual chamber cast iron Master Cylinder with ?? and 9/16? ports on the right hand side. Ideal for 64-66 car with Automatic Transmission and Front Disc/ Rear Drum set up. The new 7?? single diaphragm booster very closely resembles original Bendix Units and has been bench tested for quality and zinc plated for an attractive durable appearance. Easily painted Black for a more original appearance. Also features an Adjustable Push Rod for Pedal Height. To be used on cars without factory Power Brakes. Bending new steel Brake line is required, part number PBC-MCL is a great time saver.