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Emily from SWISCO responded:
September 16, 2021
Hi there! It looks like you have two different balances in the pictures above so I will address them separately. For the balance stamped "2530", it looks like you have either our S351-26, with a 15-002 bottom attachment, or S390-26, with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need. You'll also need a spring strength option of 2530. 
Comparison of the S351 and S390 balance shoes.
For the other balance in your pictures, you could have either an S380 or S385 channel balance. You’ll need to measure as shown below. The Series 380 has a 1" bottom attachment, and the Series 385 has a 1-3/32" attachment. Is there a stamp on your metal channel? If not, you'll need to weigh your sash on a scale to determine the appropriate spring strength option. There's a chart on the S380 and S385's store page that will show you which option you'll need based on the weight of your sash. 
Comparison of the S380 and S385 balance shoes.
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