Re: 25 hp Merc
The "bracket" is there already, the holes are tapped into the crankcase. Just two bolts. You need the ring with the teeth that bolts underneath the flywheel, the starter, solenoid, and the start button. I saw a kit once for like $75, minus the starter. If you want it to charge a battery, you need the "black" flyweel, and a rectifier.