This Mallory ZB distributer is New Old Stock its absolutely perfect it fits the aluminum front covers which has the lover shaft support I consider the best cover made for the 49 to 53 flathead engine.. Even the box is in outstanding condition for its age. All of the original paper work is included which is also in great condition. Its rare in the 21st century to find such an early piece of flathead performance parts in never used condition. The original flathead Mallory distributers are an excellent ignition system improvement. Even when compared to todays offerings for the Ford flathead. I'm asking $400.00 for this Mallory shipping is extra. Send me a PM if interested. Ron