Patio glass door roller

A handy person from San Clemente, California says:
The roller is worn and has developed a flat spot. We want to replace this part of the roller assembly, and hope you can help us. Thank you.
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Bob from SWISCO responded:

I believe this is just the inner portion of a roller assembly, with the outer housing missing. If so, see our 81-258 . Look over the dimensions and see if you think this might work for you. 

A professional from CA says:
Take a look at 81-178 .
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