Sliding door roller

A quick learner from Wilmington, NC says:
Hi Tim, thank you for responding to my email, I have gotten parts from y'all to repair several slider on a condo property recently acquired. You have been a savior to these old doors. This one is a bit different than the others. I don't see any makings or model numbers on it I hope you can help. I found a couple that were similar but my order was canceled for some reason.
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Lauren from SWISCO responded:

Hello, thank you for posting! 

Your roller is similar to our product code 81-243. Please compare the below dimensions to your part for a good fit! 

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