I can not find it on website

A handy person from Illinois says:
October 24, 2019
Windows not sliding properly.
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Paul from SWISCO responded:
October 29, 2019

Perhaps you can use something like our 87-147 window roller. Take a look, along with the dimensions, and see if this can be used to repair your window.
Superlite Sliding Window Roller, 1/2" Flat Wheel
Superlite Sliding Window Roller, 1/2" Flat Wheel
87-147
$2.97
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