replacement tandem rollers

A home owner from Arkansas says:
I need two tandem replacement rollers for sliding glass door - outside - original is Truth # 30410. Which if your products is/are the correct one(s)
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Dave Sr. from SWISCO responded:
I received a question similar to this one not too long ago and I suggested the customer look at part 81-137. Please let us know if this roller is similar to your part.
A handy person from massachusetts says:
I have a Morgan glass slider in a wood frame. I looks like the 81-018 tandem roller unit would work. could you please confirm? Thanks,Mike
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Tom from SWISCO responded:
We would be happy to research this for you if you cannot identify the needed hardware on our site. Please send detailed photos with measurements.
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