Sorry for being absolutely no help on this at all....
Hey Ryan that's a big help really, 'cause it means that two of us can't figure it out :-/
The thing in the second picture is a split ring, a retaining clip of some kind. I have one in the bag of old parts that is similar, and I'm pretty sure it's the clip that is on the rear output shaft..the one where you need to slide the bearing out of the way to remove...
When I get the old shaft out I'll see what is in there...but I've already replaced it and the roller bearings once, so I could easily have left something out the first time....
I'll call Novak in the morning and see why those parts are there....it is probably pre-packaged for several applications, they were all in the same parts bag and the shaft was separate...
I was going to tackle this today but my enthusiasm is fading.....