SGD R20 120x96 Sliding Door

A home owner from Nv says:
Can you tell me what part this is so I can buy a replacement?
Thumbnail of the uploaded file named 15730870891008441515750582585805.jpg
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Paul from SWISCO responded:

We appreciate you for writing in to us. Check out our 81-158 dual roller assembly and see if your measurements match up with ours. 

A quick learner from UTAH says:
2 QUESTIONS
THE CORRECT ROLLER REPLACEMENT
HOW TO REPLACE THE MISSING HANDLE MOUNTING SCREW, LOWER INSIDE?
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Tom from SWISCO responded:

I'm afraid I can't answer either question for you without more context. At this stage you could have anything. The best place to start would be of clear photos of both the roller and handle set. I can then do my best to advise you based on the data given.

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