Here are a couple of photos of a 1956 Evinrude 15 HP powerhead with electric start. It is sitting on a 1956 Johnson 15 HP leg but no matter. The starter for 1956 motors is six volt. IMHO there are no new six volt starters available. I don’t think that the (1956) bracket that mounts the six volt starter will fit a 12 volt starter. Distance between the starter to bracket mounting holes differs between 6V and 12V starters.
Maybe a bracket for a 1957 Evinrude 18HP which holds a 12 volt starter would work, I don’t know.
Best chance to get the necessary parts to go to a six volt starter would be to find an electric start parts motor.
