Wilwood's Tandem Aluminum Master Cylinder for Mustangs comes with the correct pushrod a 1516 bore, and is available in 3 finishes plain, ball burnished, and black e - coat. These master cylinders are designed primarily for manual applications and include the correct pushrod for the factory 64 - 72 brake pedal. They're designed for mount flanges from 3.22 to 3.40, which match the 64 - 72 factory manual master cylinder mount, and offer fluid outlet ports on both sides of the bore. The stroke is set at 1.10 with a volume ratio of 21 between the primary and secondary chambers. Machined from high - pressure die castings, each master cylinder weighs only 3lbs, a 75 weight savings over most cast iron OE type master cylinders. We also offer a combination proportioning valve kit, which includes brackets and stainless lines specifically for use with this master cylinder, see PN 260 - 13190, or 220 - 13189 for retrofit kit