Just wanted to post a message about something I found out here recently! I am working on an early styled (Unstyled in my case) John Deere A with the top starter! I am found that starter number 6578 will line up and work great with a 12v battery! It is a gear reduction starter that can be purchased new for around $100! You will also need a starter button or key switch to complete the install! As to why I am putting this on my Unstyled tractor? I built it for pulling and has too much compression to hand start now! The flywheel and top engine cover from the long hood early styled A?s fit fine on it! Hope this can help someone else!