Missing ? Sliding Doop Rollers

A quick learner from Seattle, WA says:
May 14, 2020
Rollers seem to be missing from patio door. The door does open and close smoothly, but is beginning to need a little more force. I don't remember the door ever having rollers. There was never a rolled adjustment screw on either side of the door. Is it possible that my model does not require rollers?

If possible, I would like to add rollers?? How to I pick the roller that would fit my door? Are they all standard??
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Casey from SWISCO responded:
May 18, 2020
Hello,
If your door is still opening and closing, I'm certain there are rollers inside. It looks like someone may have removed and misplaced the adjustment screw at one point, but I do see what may be an installation screw above it. 
Unfortunately, replacement rollers are anything but standard, so we will need to see a roller removed from the door with dimensions to compare to our inventory. Thank you!
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