No markings found. Track is for large, heavy sliding mirror closet door

A home owner from Burbank, CA says:
Looking for replacement track for large sliding mirrored closet doors as identified in attachments. Manufacturer of doors may have been Monarch. They were purchased and installed in 1990.
A customer submitted image of their closet door track.
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Tom from SWISCO responded:
Thanks for posting. This track seems to resemble our 23-256. Check it out and see if you agree. Keep in mind that the most important dimension is the distance between the two rails, center-to-center. What is that dimension on yours?
Profile view of 23-256
A professional from Burbank says:
Item 23-256 won't work. The space between the two rails is too small. As you can see by the dimensions in the provided simple diagram the distance between the rails of the existing track is 1-7/8, approximatley 3/8 of a difference. Any other suggestions?
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Tom from SWISCO responded:
You could possibly try our 23-257, but I can't guarantee it will work. This is the widest track that we have.
Profile view of 23-257
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