Need replacement roller for slider.

A home owner from Maryland says:
October 9, 2020
The 81-090 looks like part I need EXCEPT my wheel is flat and your part shows it being concave.
My track for the slilder is flat, without a raised edge which a concave wheel seems to use.

Where can I find a flat surfaced wheel?
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Tom from SWISCO responded:
October 13, 2020

I've never seen this before. This is very odd, and part of me wonders if someone altered your original roller to use this kind of wheel. 

Unfortunately, we have nothing that can work for you in this capacity. Would you be able to purchase the 81-007 and swap the wheel out for your old one? The video below may help with that.
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