Missing ? Sliding Doop Rollers

A quick learner from Seattle, WA says:
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:
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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