RG1
Platinum Member
It looks like these boys right here fit.
3 Pack G5 Gator Mulcher Blades Cub Cadet 742 0677A 942 0677B 54" Oregon 598 672 | eBay
I don't think so. Those blades have a round center hole, and the blades in your other link have the star center hole like so many Husqvarna mowers do.
For your engine specs, I need the actual Kohler engine model and number. Not the engine serial number- the model number. You probably have a Kohler Courage engine, and the model number would be on the data tag on the engine itself.
One other thing- Mo-deck is a waste of time and money. Nothing, and I mean nothing will last for more than a few seconds under a mower deck before being blasted off by the dirt/dust and clippings.