A professional from bonita springs, fl says:
March 21, 2016
Looking for the roller on the left. The screw is in the opposite position. Adjustment screw is on the top.
Dave from SWISCO responded:
March 23, 2016
If the new roller fits, you may be able to just switch the holes in the door rail. Use the adjustment hole for securing the frame and the other hole for the adjustment screw. I have done that in the past when this kind of situation cropped up.