Patio roller assembly

A quick learner from Bethel Park, PA says:
Patio roller assembly Also has a square nut that came off when I loosened it. Some of the parts that you have seem close, but are not exact. Are you able to help me determine which roller assembly I need?
Very much appreciated, Bill 
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Dave Sr. from SWISCO responded:

It appears that you purchased the 81-095 roller which does look similar to your original. I'm not sure if we have anything closer. Can you tell me how your dimensions match up to ours? If there are differences, can you tell me what they are?

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