Lower track guide wheel, 8' mirror steel bifold closet door

A handy person from Delray Beach FL says:
I need to replace this wheel, I sure hope you can help.
User submitted photos of bi-fold door hardware.
Profile picture of Paul
Paul from SWISCO responded:
The nylon roller guide you show resembles our 21-174, which itself is designed to work with the 21-450 style track. See what you think!
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