help replacing window balances

A home owner from Cape Coral, FL says:
I need help in identifying these balances. I have 4 windows right now that are really hard to open and need to balances.
Attached are some pictures.
User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
Thanks for posting! Before I can offer an applicable replacement for this channel balance, I just need to know a bit more information about the bottom attachment. Please take a look at our 15-004 and 15-005 channel balance shoes, and note their depths. As you can see, they are 1-3/32" deep and 1" deep, respectively. Which one more closely matches your own bottom attachment?
A handy person says:
I think they are a little deeper than 1". The entire balance is 30 inches long and the window weights 27 lbs.
Profile picture of Tom
Tom from SWISCO responded:
Great. If it's deeper than an inch, then I think it's safe to say that we're looking at a 15-004. Take a look at our S385-30 channel balance with a 2940 option. How does that look t you?
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