Plastic wheels on #81-139 my only option?

A home owner from Hemet, CA says:
My patio door needs new rollers #81-139 - this new version has plastic wheels; the old ones I'm replacing are steel. I read 2 posts here that indicate: (1) plastic wheels are the only option for this item #81-139 and (2) steel is a longer lasting choice. Am I stuck with plastic wheels?
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Tom from SWISCO responded:
Thanks for posting! We have located a possible replacement part, and will post in this thread as soon as we have more information available.
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Donna from SWISCO responded:
UPDATE: SWISCO product code 81-139, Roller Assembly, is now available with a steel wheel option.
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