flywheel nut size?? 77 merc 500

[Vintagenc]

ok so replaced stator and trigger. my flywheel nut has had it, anyone replaced with a nut from hardware store,or do i have to order one?

 

[schematic]

Re: flywheel nut size?? 77 merc 500

order one from OEM

 

[Vintagenc]

Re: flywheel nut size?? 77 merc 500

order one from OEM

Thanks, after looking one up to order they have the oem and oem match 5/8 18 lock nut, so I guess that anwsers the question.
Thanks