Top Sash Channel Balance Guide replacement part

A quick learner from South Carolina says:
Can you identify the proper top sash channel balance guide i need? I need the top left side part. If would work with the S371-31 channel balance, if this helps. Thanks for the help. Tom
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Lauren from SWISCO responded:

Hello, thank you for posting,

Please start by reviewing the dimensions of the 18-118 top sash guide pair to see how it compares to your original.

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