replacement wheel and slider guide for mirrored closet doors

A quick learner from San Francisco says:
I'm looking to replace a few of these where the wheels have cracked or broken but can't seem to find the exact same part...

any ideas?
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Tom from SWISCO responded:

Your roller looks like an older version of our 23-222C, just with one of the wheels missing. The design is a little different but I'm pretty sure our more modern part can still replace yours.

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