Cox closet door wheel replacement

A quick learner from Los Angeles says:
I need the replacement for this closet door wheel. I need 4 of them. ? Can you tell me if you have them?
Thumbnail of the uploaded file named COX 21-717 21-767
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Casey from SWISCO responded:

If your wheel is concave, then our 23-086 mirror door roller can be used in its place. Check it out and see what you think. 

A quick learner from USA says:
how is this different from Product Code: 23-070? does it perform differently?
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Tom from SWISCO responded:

The 23-086 has a ball bearing wheel while the 23-070 does not. I'm personally of the opinion that ball bearing wheels operate much better than the alternative.

Sliding closet mirror door rollers and tracks
Sliding closet mirror door rollers and tracks
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