Jasmine from SWISCO responded:
August 17, 2023
Thanks for writing in! Your coil balance assembly reminds me of our Series 161 Constant Force Balance System. Since the housing of your coil assemblies are stamped with both a 6 and a 7 it is likely that you have 26lb window. With that said, you'll need the S161-6 along with the 15-086 tandem coil housing and the S180-7 coil balance spring. You'll install the Series 180 coil in the tandem housing and then attach it to the Series 161 Roller-Tilt. Alternate image for S161-06
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