Closet door rollers

A handy person from Phoenix says:
There are no markings. Any ideas where these can be found? I need 8 of them for 2 closets.
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Tom from SWISCO responded:

I'm afraid that I'm not familiar with this roller. Could there be more to it, or is this all there is to the assembly? Can you also tell me what kind of closet door this goes on? Is it a bypass or pocket door?

A handy person from Phoenix says:

It is a sliding closet door for a double closet. There are 2 of these per door, for a total of 4 per closet.

Our house was built in the 1950's and these seem to be original. Super smooth, high-quality mechanism.
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Dave Sr. from SWISCO responded:

Your rollers look similar to our 23-189 assembly, but I'm not sure if this could work for you. Could you possibly just replace the wheels with something like the 10-141? Or, lastly, you might need to replace the complete track kit like the 23-500, 23-501, 23-502, or 23-503. That could be a last ditch effort if all else fails.

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