Help identifying roller/hinge hardware replacement for bifold wardrobe doors

Hello,

I need to replace two rollers that are used to hang bifold wardrobe doors…
Unfortunately, the actual rollers (wheels) do not appear to be removable, but they are attached to a rocker bracket that is labelled “1123".

Can anybody please identify this piece of hardware or know where I can buy replacement parts? ...I have tried a couple of places that sell roller replacement parts (e.g., Rolltrak) , but no luck. :?

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