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Casey from SWISCO responded:
January 3, 2024
Hello, It looks like you have either our S351-16, with a 15-002 bottom attachment, or S390-16, with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need. You'll also need to locate the stamp code on the metal channel to choose the corresponding spring strength option for your replacement balances. 
Comparison of the S351 and S390 balance shoes.
As for your sash lock, take a look at the 90-042 and see how the dimensions compare to your lock. Thank you! 
Detail of 90-042
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