19-inch sash balance

A home owner from Thousand Oaks, CA says:
Markings on sash balance: 1820 B.S.I. V
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Paul from SWISCO responded:

Hello there, 

You didn't give dimensions, but being in California, you probably need the S385-19 side load balance with a spring strength option of 1820. Compare our dimensions to yours and see if they match up. 

A home owner from Thousand Oaks, CA says:
I followed your suggestion and they are a perfect match. Just installed and they work great, and a huge improvement over the older balances.

Thanks so much for your help.
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