100% brand new, never been used. The booster mounts with a 4-bolt pattern. 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 ball milled 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. It will accept the popular OEM or aftermarket 7″ or 8″ power brake booster. Professional Installation is Highly Recommended??? Best choice of motor parts. 7 Universal Firewall Mount Power Brake Pedal Dual Booster Master Disc/Drum Kit. Professional Installation is Highly Recommended?? The orders of Friday would be shiped in the next Monday. Our office hours are 8:00 a. M to 5:00 p. M (GMT +8) of Monday to Friday. And our Office is closed on weekends and public holidays. We apologize for the late reply during the holidays.