Identifying the correct replacement balance

A handy person from Gig Harbor WA says:
Greetings..I am interested in replacing several 1/2" balances. I have 2 sizes needed (ACTUAL length of 16" and 22"). I am attaching several pictures to help identify the existing balances with the correct replacement balances. Included in the pics is the stamped markings on the 16" and 22" balances. Also attached are pics of the each end of the balance (plastic pieces). All the plastic pieces are the same for the 16" and 22" balances. Thank you for your help identifying the proper replacement balances. Good Day!
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Bob from SWISCO responded:

Thanks for posting. If the nylon attachments are the same for both sizes, then take a look at the S395-16 and the S395-22For the S395-16, the stamp number of 15 3 conforms to our stamp option of 1530, which is for a window sash weight range of 10 through 12 lbs. For the S395-22, the stamp number 21 3 conforms to our stamp option of 2130, which is for a window sash weight range of 12 through 15 lbs. Let us know if you have any other questions.

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