Advice on adding electric start to a 1968 Johnson FD-22A.

[Electronic M]

So my parents and I own a small late 60s bass boat that appears to once have had an electrical system and electric starting but the electronics were mostly stripped out at some point.
The folks are getting a little old for the pull cord, and the pawl on the cord recently failed so I'd like to use the pull cord less to make it last longer.
Doing my research, according to the Seloc repair manual only the 35HP and up motors had an electric start, but the engine has a toothed flywheel and appears to have room for a starter motor. An internet search reveals that other FD family models had electric start as did a later version of my engine with increased HP, and there's threads explaining that all that is needed is a starter motor and possibly a bracket, but no part numbers. Does anyone know the motor and bracket part numbers I need to order for this?

(The battery solenoid etc I can figure out myself from what I know about electronics and cars). The boat is configured to pilot using the handle on the motor so I don't need to worry about remote choke or magneto kill switch (minimum throttle stalls it quite well).