Request info on Tandem roller unit for BetterBilt slider window of 1991 vintage.

A quick learner from Oro Valley, AZ says:
No stamps or part numbers shown on unit
User submitted photos of a window roller.
Profile picture of Paul
Paul from SWISCO responded:
Please see our 87-181 tandem window roller. This has been known to work in some Better Bilt sliding windows, but review our information and see if you can get this to work.
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