Sliding glass door wheels

A quick learner from Bermuda says:
There are no names or markings.
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Bob from SWISCO responded:

I am afraid this is an older roller, and the assembly is no longer made. If your roller's housing is intact, see if you could replace the wheels with either our 81-266 or 81-272 kits. The video below shows how. Apologies for any inconvenience. 

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