OK, so I was able to remove the glass and take a closer look at the rails, I think my initial assumption was wrong. Looking at the other rail the guide that is actually attached to the glass was broken. You can see it from these photos.
Now I am getting confused when I look at the parts sheet.
I am having a hard time locating which part I am looking at, I think it is 73633. but I am not sure.
Any Guidance?