Jasmine from SWISCO responded:
April 26, 2023
Thanks for reaching out! Your balances appear to be the S765-27 channel balances, which have a screw clip attached to the top and a pivot shoe hook on the bottom. You'll need the 26-5 stamp which is rated to carry a sash weighing 17 to 23lbs. Let me know if your balances differ from ours at all. This balance is typically used with the 15-046 pivot shoe and the 26-040 pivot bar. Alternate image for 15-046
Alternate image for 26-040
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