Nuair window without balances

A quick learner from Astatula says:
Hi,
I am looking for balances for an old window (around 1995). Apparently, the balances were removed or broke at one time and were discarded. The bottom sash weighs 5.8 lbs. Visible glass on the bottom sash is 15 in.
Any idea which balance will fit?
Thanks for your help.
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Paul from SWISCO responded:
I think we can help you with this. If you do in fact have a Nuair window, see if your top sash guide matches to our 18-178. If so, then our S385-16 channel balance with a 1510 option should be able to be used as a replacement. Get back to us and let us know how you made out.
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