The 4 bolts are in a perfect square and are 3 3/8 apart (center to center). The master cylinder in this kit is the Flat Top style, and features a 1" bore and the ports measure 9/16" and 1/2. This master cylinder will work with any drum/drum, disc/drum, or disc/disc setup. Firewall mount power brake pedal conversion kit is used to mount the booster and master to a more convenient firewall location.
It will accept the popular OEM or aftermarket 7" or 8" power brake booster with a 4 bolt pattern measuring 3 3/8 center to center. The arm is threaded 1/2"-20 to mount a pedal pad and the pedal arm can be adjusted in 1-1/2" increments Pedal Pivot Point adjusts to 7", 8-1/2", 10", 11-1/2", and 13...Total length 14 to get that fit you need for your vehicle. Chrome Aluminum Brake Master Cylinder Smooth Top 1 Bore Screw Down Style. Universal Under Dash Pedal Kit. As shown in our pictures. Professional Installation is Highly Recommended (No Instruction Included).