Window Roller for Old Aluminum Sliding Window

A home owner from San Francisco, CA says:
The bottom rollers of a very old aluminum sliding window need replacement. I am unable to remove part but I have pictures of intact top rollers, damaged bottom roller as well as loose wheel. Do you stock a replacement part? I need 2.
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Tom from SWISCO responded:

I can't make out exactly what you need from these photos, but it reminds me of our 87-224. The design seems very similar. Look this product over and see what you think.

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