Unable to locate the part

A home owner from Torrance, CA says:
Hi, this company (International Window) seems to be out of business and we're having a hard time finding the replacement roller for our patio sliding door. The door is almost 25 years old. Can you help me somehow? Thanks!
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Bob from SWISCO responded:

Take a look at our 81-056 or maybe our 81-176 . Look over the dimensions of both rollers and see if one of these match up. 

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