Quarter window question

So I started digging into a quarter window issue today… the window wouldn’t roll up and down normally. I bought a new regulator because I was pretty sure it would be shot.
After disassembly I noticed a roller was missing and the roller that was left on the regulator wouldn’t stay in the channel that’s at the bottom of the window. I replaced the regulator thinking maybe it has been forced and an arm was tweaked. Well new regulator in and had same issue. Does anyone have any ideas? I suspect the quarter window slide may be bent or put in wrong… can anyone tell me proper orientation? I know channel goes toward outside but which is top and bottom?

Thanks

Well FYI… apparently when they took out windows when the car was painted they put the passenger slide in the driver’s quarter window and vice versa in reassembly… I figured this out from comparing photos of right and left slides to the slide that was on my left quarter window! DAMN!