Tom from SWISCO responded:
May 16, 2023
This part is called a top sash guide. In terms of design, it's very similar to our 18-166. However I can't quite determine your precise measurements based on just a photo of a tape measure. It's a little hard to make out. I suggest reviewing the specs below to verify that the 18-166 size aligns with the original. Detail of 18-166
Profile view of 18-166
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