Tandem sliding door roller

A home owner from Port Orange, FL says:
I'm looking for some of these tandem roller assemblys for a 8' X 4' glass sliding door.They look similar to your 81-171 part. The aluminum extrusion is 3/4" wide X 5-1/16" long X 1-9/16 high. What would you recommend as a replacement?
Thanks, Chris
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Bob from SWISCO responded:

Hi Chris. Yes, I would go with the 81-171 as well. Let us know if you have any other questions.

81-171 : Tandem Roller Assembly, 1-11/16
Tandem Roller Assembly, 1-11/16" Nylon Concave
81-171
$32.73
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