Need replacement for DSH20121

A home owner from Waterloo, ON, Canada says:
Our door roller is brocken. As far as I can tell it's DSH 20121.
Is it discontinued? With what can we replace it?
Thanks
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Tom from SWISCO responded:

I'm afraid I can't tell what you have from this picture. Most of your roller is cut off at the edge of the photo. Can you show me the whole part? Seeing it out of the door would be a huge help, if possible.

A home owner from Waterloo, ON, Canada says:
Sorry, can't get it out of the door,but tried my best with new photos !
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Tom from SWISCO responded:

Thank you! That's fine, I can definitely work with this. See our 23-026 bottom guide, I think you'll find this is a very close match.

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