I think it is a top sash guide

A home owner from Hilliard Ohio says:
Across the top is 1 5/8 inches
Length 1 1/2 inches
Width 3/4 inches
The window is about 23 years old. The channel balance number is 2830
User submitted photos of a top sash guide.
Profile picture of Tom
Tom from SWISCO responded:
Yes, this looks like a top sash guide. Please see our 18-124P. Could this be what you need?
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