Windows balance

A quick learner from Pa says:
I m looking for these items to fix my window.the size are lengh 25 and 25 58.
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Casey from SWISCO responded:

Hello,

You can start by comparing the specifications of the 3/8" diameter S900 spiral balance, 26-139 aligner, and 15-045 pivot shoe to your original hardware. One thing to note is that you should only include the housing tube when measuring the length of your balance, not including the spiral that extends from the tube or colored tip. Thanks for posting! 

A quick learner from Pa says:
So this all the hardware that i need to fix my window.i will measure the. Balance when i get home from work .i have a question how many balances a window has?and if the differ in size.Example back top window the spiral balance is longer?Then front window?
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Casey from SWISCO responded:

Most single-hung windows with one mobile sash will have two balances. If the window is double hung with two mobile sashes, there would normally be four balances. The balances for each sash may be different lengths and could have different tip colors for different sash weights. For these reasons, it's important to remove a balance for each sash to make sure you purchase replacement parts with the correct specifications. 

A quick learner from Pa says:
These are 2 balances one 27 and 25 inches long .The tip are red and with is 5/8.
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Casey from SWISCO responded:

In that case, see the 5/8" diameter S600-25 and S600-27 spiral balances with red tip options. The fact that you have larger balances leads me to believe that you most likely have an older version of a pivot shoe like the 15-015 , but you'll need to compare the width and thickness to your original shoe to confirm that this will fit in your window channel. Thank you. 

A quick learner from Pa says:
Yes my the house is very old in pa.ok so im orde them and the shoe
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