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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Manuela 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.

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