Help with leak on booster motor LA01N

I have a leak from one of the bolts (part 3285-56) .  This booster motor is used to run a polaris. What part do I need to replace.  Note all other bolts are not leaking.  I tightend all the bolts but they were secure.

We’d recommend replacing the shaft seal and the volute o-ring.

Volute O-Ring - Part Number 3285-61

Shaft Seal - Part Number 5250-106