Help ID Coil Balance

A handy person from Williamstown, NJ says:
Please help me ID these coil balances. The windows are approximately 13-14 years old and are single hung. There appear to be different balances on each side and the metal part is marked with a "4". The window sash falls closed and will not stay open. Thank you for your help!
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
Please see our S190-440, I believe this is what you need. I've also related other parts you may be interested in, which you can see on the right side of this page.
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