Sliding patio door wheel

A home owner from Fontana CA says:
I need to replace this part. Where can I purchase it?
User submitted photos of a patio door roller.
Profile picture of Dave Sr.
Dave Sr. from SWISCO responded:
This roller looks like our 81-156. However, the 81-156 is a tandem roller, while yours appears to just have one wheel. That might mean our 81-156 could be too long to fit into the cut out at the bottom of your door. Please compare your measurements to our 81-156. How well do they compare?
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