Casey from SWISCO responded:
May 18, 2023
Hello, Your coil balance resembles our 15-087 housing pivot, which uses the Series 180 coil springs, 16-031 bracket, and other parts listed on our product pages. For a 19-pound sash, you could use one S180-9 coil on each side. Take a look and let us know if you have any other questions. Pricing for each part is shown on our product pages as well. Thanks for posting! Dimesnions for 16-031
Detail of 15-087
Series 180 coil balance diagram
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