81-011 with concave wheel

A handy person from Philadelphia PA says:
Hi, we placed an order for replacement patio roller, item number 81-011. We measured and found this item to match what we have but never noticed it had flat wheels. We need concave wheels. Is there a different item number for this housing unit with concave wheels? At this point, the door will not open without lifting and sliding.
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Tom from SWISCO responded:
There is something similar, yes. In fact, look at the 81-011 store page and look at the right hand side, under "Related Items." You will see the 81-090 listed. Could this possibly be what you need? Double check your measurements and housing and see if this roller may be a better match.
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