Spiral Balance for tilt Andersen Windows over 10 years old

A quick learner from Moncks Corner, SC says:

Andersen single hung Winddows do not stay, The diamater is 3/8 29 Lenth for four windows needs 8 spiral balance, and a window 3/8 diameter 13 Lenth I need 2 spiral baalance, as you can see and the picturo green color , not sure which serial number to order, please help me out. 

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Casey from SWISCO responded:

Hi there. Take a look at our S900-13 and S900-29. These seem to be the right replacement parts for you based on the information you provided. Thanks for posting!

How to replace a tilt window spiral balance.
How to replace a tilt window spiral balance.
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How to Identify a Replacement Spiral Balance
How to Identify a Replacement Spiral Balance
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How to choose the proper spiral balance tip color
How to choose the proper spiral balance tip color
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How to adjust a spiral balance on a tilt window
How to adjust a spiral balance on a tilt window
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