Hard to find roller

A quick learner from California says:
The doors were installed in 1977. There are 8 doors total in 2 units we own. All the rollers need replacing.
roller
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Tom from SWISCO responded:
Could we see some more photos? We'd like to see the back and the top of the roller. We'd also like to know some specific dimensions. Can you type those out for us?
A professional from CA says:
Without a clear view of the back end I can't say for sure, but it looks like 81-085 .
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