Jasmine from SWISCO responded:
August 3, 2023
Thanks for reaching out! Our Series 380 Channel Balances are not sold in 7/8" increments, so it is very likely you'll need the S380-28. You'll need to select the 2730 stamp. This top sash guide looks like it could be our 18-008 5/8" Top Sash Guide. To confirm, take a look at the dimensions and compare them to your existing part to confirm. Detail of 18-008
Alternate view of 18-008
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