Plastic Window Channel Balance Sash?

A quick learner from Irvine, California says:
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:

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! 

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