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Casey from SWISCO responded:
June 30, 2021
Hello, It looks like you have either our S351-34, with a 15-002 bottom attachment, or S390-34, with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need. I agree that the 3365 stamp option should work for you as long as your window sash weighs 39 pounds as indicated by the balance stamp. The balances come with the top and bottom fittings already attached. Also, these types of balances are often 1" longer than the stamp number, which is actually equal to the height of the visible glass in the window sash. Thank you! 
Comparison of the S351 and S390 balance shoes.
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