Tom from SWISCO responded:
August 3, 2021
The part you're looking for is called a top sash guide. It's tough to determine what yours is from a broken piece but the general design reminds me of our 18-166. I recommend that you review this part to start out and see how well its size matches your original. If you have an undamaged version, perhaps from another window, then I highly recommend using that to take your measurements when you compare it to ours. That will make things a lot easier for you. Profile view of 18-166
Detail of 18-166
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