Available now from Spitfire Motorcycles, Brass Breather Bolts!!! The perfect accessory when using a Spitfire air cleaner. These little beauties are a great alternative to cross over hoses when eliminating the stock air box. Precision CNC machined from USA made Brass right here in our shop. These Breather bolts have a 1/2″-13 thread, that is 1.00″ long. Six .062 vent holes along the hex provide plenty of venting volume, while concealing the opening. Bolts sold in sets of 2.