ID my patio wheels plz

A home owner from Bakersfield CA says:
the sliding door is over 40 years old, first set lasted 25 years, last set lasted 10, I like to replace both of the 1½" nylon wheels with their housing, but if no housings they'll just take the wheels, would rather have steel wheels if they make them for this design
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Bob from SWISCO responded:

This roller looks a lot like our 81-258 . We do carry a version of this roller with a steel wheel: see the 81-258S

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