Help to buy right serie, non-tilt block and tackle balance system

A home owner from Miami says:

I need your help, I have 4 non-tilt single sash windows which are not working correctly even some of balance system are broken. But I do not know which of your items I should buy. Please help me to choose the correct serie and item. I need 8 item. They are impact windows.

These metal channels have the following stamp or imprint, 34 90 / 29.

Measures

Channel width 9/16?

Channel length, only metal 34 9/16?

Weight about 29 pounds

And wing shoe about width 15/16?

Please, let me know which I have to buy.

Thanks

Jose 

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Casey from SWISCO responded:

Hello,

Take a look at our S350-35 channel balance. If your window sash weighs exactly 29 pounds, you'll need a 3440 spring strength option. If you haven't removed and weighed the sash yet, I would recommend doing so and following the chart under our product description to make sure the channel balance you choose will support your window without being too weak or too strong. Thank you!

S350-35 : 35
35" Series 350 Channel Balance
S350-35
$11.59
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