So there's where the trouble started. The top hinge of the window is just a hook kind of thing, and you need to put the window almost upside down in order to get the hinge in.. but then there is no way to get he plastic rollers in the side slider things.
I took apart half the inside of my van trying to get to the window to see if the arms could be rmeoved or moved, but I failed at finding a way. There might, be damned if I could figured it out.
So I went to Plan B. Drill out the rivets holding the plastic wheels to the arms, and redneck machine (grind) some bolt heads down to fit.
Insert bolt into plastic wheel, slide into slider thing, install hinge, bend arms over bolts. Add a nyloc, then another regular nut with a squirt of loctite, and Bob's your uncle.
Works great. More work than I planned, but to have SMB replace both of these woulda been $1600, so worth a few hours trouble.