Quarter Glass

So in effect I am missing the complete ball stud and roller from the right side and the roller from the left side. Then the roller must be pressed/pushed on to the ball stud...correct?
My car is in the shop so all the parts are still in the bag. I guess it is pressed on. I was missing a rear track and a nice fellow on this forum was able to send me one You might be able to do a WANTED post on here to get the ball.