Spiral Balances

A handy person from USA says:
Kindly help us determine if you have a product that will match up to the original.

Below are a few pictures of the original window balances.

Lower Sash measures 39.5
User submitted a photo of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
Your measurements got cut off, but we can still help. Looks like you have an old wood window with an equally old type of spiral balance. We like to use our Series 500 to replace this, and have been since the 50's. I would also recommend a bottom bracket like our 17-007 to help attach it to the sash. Let me know what you think!
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