window sash springs

A contractor from Kerrville, TX says:
the spring measures 3/8

don't know what series to order

it is 30" long
User submitted image of their window hardware.
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Tom from SWISCO responded:
Thanks for posting! For these old wood sash balances, we like to recommend our Series 500 spiral balance, along with a bracket like our 17-012. I believe this should work for you.
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