Sliding glass door roller

A handy person from Pa says:
I'm looking for replacement rollers for the sliding door in my camper they are stamped with Ultra I was not able to find them on your site.
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Bob from SWISCO responded:

Hello there. I am afraid this roller is no longer available. Our 81-032B could possibly work as a substitute. Review the diagrams below, compare to your old roller, and let us know if you think this could work for you.

Detail of 81-032B
Detail of 81-032B
Profile view of 81-032B
Profile view of 81-032B

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