Sliding Mirrored wardrobe door

A home owner from USA says:
Currently have sliding mirrored doors in bedroom. Unfortunately 2 runners broken. Would appreciate any suggestions. Have attached photos which may help.
Many thanks
User submitted image of their closet hardware.
Profile picture of Paul
Paul from SWISCO responded:
Hello, Denise. I'm having some trouble identifying these. Is there a name or code printed on the metal bracket itself? Also, are these for the top or bottom of the door? Finally, is that a black wheel in the white housing? It's tough to make out. Let me know!
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