A quick learner from Mn says:
July 19, 2016
Do you have this part? Mounts in vertical side rail. Top and bottom of the vertical
Dave from SWISCO responded:
July 25, 2016
Thank you for posting. Not sure if you can use it as a replacement in your door, but take a look at 84-034. See if you can adapt that to your patio screen door. It is a little shorter than your roller, but see if the other dimensions line up.