I’m pretty sure it will Dave. I’ve converted several motors to electric start but I’ve lost track of which bracket came from which motor. The only difference in them was the solenoid mounting location. Some had the solenoid on the starboard bracket while others had it by the starter on the port bracket.
I have a few 18’s- 20’s apart right now and can check several starter brackets later today for you.
From the ’63 Johnson accesories catalogue:
