Plastic Window Channel Balance Sash?

A quick learner from Irvine, California says:
March 31, 2021
I need help finding these Plastic Window Channel Balance Sash parts. The windows were made by pacific window corporation.
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Emily from SWISCO responded:
April 2, 2021

Your current top sash guide is discontinued. Our 18-171 can replace it but you'll need to cut the top off since your current one is much shorter. If you have any other questions just let us know! 
Stepped Sash Guide, Alpine
Stepped Sash Guide, Alpine
18-171
$1.35
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