Window balance replacement parts

A home owner from Lehigh Acres,FL says:
I need to replace some balances. I think they are code S377 30, need to verify. They are 1/2 x 30 size. The stamped number is 2950.
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Bob from SWISCO responded:

I agree, this looks like an S377-30 to me. Just go over all the specifications to confirm. For a new stamp option, choose 2950. 

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