Starting system for 1940 M

[ricksfarmall]

I'm restoring a 1940 Farmall M. I'm keeping it 6 volt and would like to know if anyone has a picture that shows the area where the starter switch is mounted to the vertical post in front of the seat. I need to know how to mount the starter switch that pushes down to start the tractor and what lever there might be for that. It looks to be a little different from my 1950 M. Any pictures or descriptions would be greatly appreciated.
Thanks,
Rick