Replacement slider and hangers for mirrored bifold closet doors

A home owner from Vancouver, WA says:
In 1991 two closet Monarch bifold doors were installed, one closet has three bifolds, approx. 90 in. Wide and about 75 in tall; second door has 4 bifolds, approx. 120 in. Wide by 75 in tall. Tracks are installed. The top and bottom slides are "shot". No one locally seems to have replacements. One shop came up with a rube-Goldberg fix, hasn't lasted. So, are our door sets compatible with your newer slides? If so, how do we remove the doors to retrofit them?
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Tom from SWISCO responded:
I can't say for sure. Can you show me a picture of the damaged hardware? That will help us find something that could work.
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