tilt windows wont stay up

A quick learner says:
I just replaced 2 spiral balances 900-28 .Looks like i need 2 plastic pieces that spiral balance rod attaches too.3/8 x28 inch tilt windpows ,Please help me !!!
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Emily from SWISCO responded:

Hello!

Your pivot shoe reminds me of our 15-045 which is compatible with the Series 900 spiral balance. Compare our specifications to yours and see if they match up. 

How to replace a tilt window spiral balance.
How to replace a tilt window spiral balance.
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How to Remove a Pivot Shoe (Cutout Method)
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Swisco's 15-045 Pivot Lock Shoe
Swisco's 15-045 Pivot Lock Shoe
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Anatomy of a tilt window
Anatomy of a tilt window
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How to Identify a Replacement Spiral Balance
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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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