Balance for 1985 Peachtree Ariel double hung, non-tilt ( B.S.I. 3660 ) windows

A quick learner from 04530 says:
I have to replace the balances on ten ( 10 ) windows. The length is 26.25". The problem appears to be the pop rivets and spring ends. I assume the repair will require replacement. The windows measure 29.25 h x 33.75 w.
Thanks
channel balance
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Paul from SWISCO responded:
Thanks for writing in. Our S745-26 balance would make a good match for you. As for the option, if your balance should have any numbers stamped on it, please provide us with that information so that we can inform you which option would be the one to choose. If it should not have any numbers stamped on the balance at all, the only to confirm the best option for you would be to weigh your window sash and correspond that number to our sash weight range chart on the product page.
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How to replace a non-tilt channel balance
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