Casey from SWISCO responded:
November 8, 2023
Your coil balance assembly resembles the Series 210 Roller-Tilt constant force balances. Since yours are stamped with a 12 on both housings, you'll need the S210-24. These are made for windows weighing 45 to 48.99lbs. Look over the dimensions compared to your assembly to confirm that this is the correct replacement. Thank you! Alternate image for S210-24
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