I believe it is a Simonton Window

A home owner from Olathe, KS says:

Piece broke in the track of the window. Went to shut window and wouldn't shut. The entire piece on the left side of window cracked and am hoping I can just replace that piece.

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Emily from SWISCO responded:

Hi there!

It looks like you need a new coil support. We can help but we'll need to see a photo of your pivot shoe removed from the window track to compare to our inventory. That will help us identify the needed coil support. 

Thank you!

A home owner from Olathe, KS says:
2277 is the other side of the window that isn't broke. Basically the piece disintegrated. Hope you can figure out what it is.
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Emily from SWISCO responded:

Thanks for the additional photos! This is a huge help. I recommend our 15-199 that's used with our 1/2" wide Series 160 and 3/8" wide Series 165 coil springs. It appears you have a triple coil assembly which means you'd want either the 15-150T for 1/2" wide springs or 15-205 for 3/8" wide springs. Look these parts over and see what you think.

How to replace a window coil balance
How to replace a window coil balance
VIDEO
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How to Remove a Pivot Shoe (Cutout Method)
How to Remove a Pivot Shoe (Cutout Method)
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How to Replace a Triple Coil Balance System
How to Replace a Triple Coil Balance System
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How to remove window pivot shoes
How to remove window pivot shoes
VIDEO
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Anatomy of a tilt window
Anatomy of a tilt window
VIDEO
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Removing a Triple Coil Window Balance
Removing a Triple Coil Window Balance
GUIDE
READ >
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