Need New rollers/ wheels for sliding glass door

A home owner from Beach Haven, NJ says:
Hi -- The house I bought has a sliding glass door. Label Says:

PPG Herculite 16CFR1201 CII

It is REALLY hard to slide open and I figured out maybe the wheels/ rollers are missing. Can they be replaced ? Do you have those parts ?
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Bob from SWISCO responded:

Thanks for writing in. I'm afraid it's practically impossible to say what patio door rollers you need without seeing the originals out of the door; there is too much variety, even among brands, to say otherwise. If the rollers are in fact still in the door, see the video below for replacement and removal details. We will need a picture of the entire assembly, as well as the height and width of that assembly, and the diameter of the wheel(s). Otherwise I am not sure if there is much we can do. Sorry for any inconvenience. 

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