DESCRIPTION --Universal style. --The booster will bolt up to most street rods, hot rods, and other vehicles. --It also offers approximately 20% (some say up to 27%) more stopping power. --Standard 4 bolts brake master cylinder on top. --Has 4 bolts on the bottom that mount to the firewall with 3 3/8" spacing. --We highly recommend you purchase the booster and the master cylinder from our store together, which will be perfectly compatible with each other. If you already have a deep pushrod master cylinder and you purchase our short push rod booster alone, you might need a pushrod spacer for installation. --Package: Including all items in the pictures. Note: Professional Installation is Highly Recommended (No Instruction Included). Your package will be shipped from multiple warehouses.