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Emily from SWISCO responded:
May 31, 2022
Hi there! It looks like you could have either our S380-21 or S385-21 depending on your bottom shoe depth. The Series 380 has a 1" deep shoe and the Series 385 has a 1-3/32" deep shoe. Measure as shown in the image below to see which one you'll need. You will also need to weigh your sash on a scale and refer to the chart under the product description on the S380-21 and S385-21 store pages to determine the appropriate spring strength option for your balance. I'll post a video below that will show you how to replace these types of balances, too. 
Comparison of the S380 and S385 balance shoes.
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