20 year old sliding patio door

A home owner from Ontario, Canada says:
I need to replace the rollers in my patio door but unfortunately absolutely no markings on door or the old rollers (that would be too easy!). I have no idea how to source these so I was hoping you might be able to help. Do the replacements have to be an exact match or is just something close, good enough? (I hope the pictures give you some clues). Thanks.
User submitted photos of a patio door roller.
Profile picture of Dave Sr.
Dave Sr. from SWISCO responded:
I'm afraid I don't recognize this roller. I would start by looking at our 81-030. Could this possibly work as a replacement?
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