Help spiral balance replacement needed

A home owner from USA says:
Can you help me identify this balance.
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Casey from SWISCO responded:

Hello,

I would recommend starting by comparing the S500 and S400 spiral balances to your assembly removed from the window. The determining factor would be if the housing tube has a diameter of 5/8" or 3/8". You can also find the mounting brackets that attach the spiral to the sash under the related items section of our balance product pages. Thank you. 

How to adjust a spiral balance on a non-tilt window
How to adjust a spiral balance on a non-tilt window
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