Window Roller/Slider Replacement Parts

A home owner from Los Angeles, California says:
Hello - I have several windows in a condo that are not sliding properly. I have not been able to identify the manufacture of the window and have been struggling to find the replacement part. Please see the attached photos. Hoping you can help. Thank you
Window roller
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Paul from SWISCO responded:
From what I am able to see, it seems you have an Elco sliding twin window roller assembly that has been discontinued. We still offer some single sliding wheels for you to review, our 87-212. Take a look to see if you think you could use them as replacements.
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