Parts Replacement for closet door

A quick learner from Oakland, CA says:
I would like to get a replacement for that missing parts (rollers wheel only). I'm not sure about the name of the part. Please let me know what is the cost of the part and if it is available.
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Bob from SWISCO responded:

To start, take a look at our 23-064 Roller with Concave wheels. Look it over and see if you think this could work for you. 

Sliding closet mirror door rollers and tracks
Sliding closet mirror door rollers and tracks
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 Sliding Closet Mirror Door Rollers & Tracks
Sliding Closet Mirror Door Rollers & Tracks
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