Bob from SWISCO responded:
August 26, 2021
While this coil balance system resembles the Series 161, I believe you actually have the 15-087 Pivot Shoe, which uses Series 180 Coil Balances instead. If the window weighs exactly 10.4 pounds, you'll need two of the S180-5 5 pound springs, one for each side of the sash. That will total 10 pounds of support--being within 1 pound of the exact sash weight is fine. For the pivot bar, see if the 26-040 or 26-063 match what you need. Detail of 15-086
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