Harcar parts

A handy person from Sorrento, FL says:
Need replacement balances. Harbor Windows house built 1993.
Need 2 each clips
Need 8 each balances #2940. 30"rail. 1/2" springs
Need 2 each balances #2920. 30" rail 1/2" springs

Are they available and what is cost?

Thank you.
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Tom from SWISCO responded:
I'm afraid we cannot determine what you have based on your stamp alone. All that tells us is how strong the spring is. I recommend that you look at our Channel Balance Home Page and follow the steps in order to find the Series that best matches what you have.
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