Patio door roller

A quick learner from Flagstaff Arizona says:
This is a 1 1/4 metal roller for a patio door. Can you let me know which part to order?
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Bob from SWISCO responded:

Thanks for posting. Your reported dimensions are dead on with the 81-279. Compare with the diagram below just to be safe.

Alternate image for 81-279
Alternate image for 81-279

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