For Sale NOS M12S Short Block, still in the original box. I bought it pre-emptively when Kohler was phasing out the Magnums. Thought I would have it on hand if one of mine needed it, or maybe I would find a tractor with a busted rod for cheap. Neither of those things happened, the darn things just keep running.
Part number 77 522 35, probably built in late '05, it's the combination replacement kit Kohler made to fit WheelHorse or Gravely, machined to bolt directly into the Gravely transaxle, but also has spacers to mount WheelHorse PTO clutch/brake. Also has a bunch of gaskets and seals packed with it, probably all you need to install it.
And it's heavy, so it's not practical for me to ship. Buyer arrange to pick up near Elida OH, I can lift it about knee high to help load.
Asking $800 or might consider trade for a good center mount grader blade.