I stand corrected. Ty, Jim. But I wonder if they were standard or optional, since, as Barny pointed out, most of the Ns one sees don't have them. Mine certainly didn't have them when i got it, and aside from the pics by a former member here, iI can't remember ever seeing an N with them. There are plenty of Ns in my area, and i've yet to see one with them. So - let's ask about the particular tractor in question. Mountain - does yours have them? If not, I would either buy a set - pretty sure they're still available as aftermarket - or, as In my case, I made my own. Without them, don't try to pull those stumps.
edit - I still wouldn't use the N to pull them, even with those bars. and for reference, I know u don't have the setup on that picture, since that's an 8N, and impossible to rig on a 9 unless you replace the whole rear end of the tractor with one from an 8. Seems like a lot of effort for a small return