Verification of ordering correct window channel balance

A home owner from Altadena Ca says:
I am replaceing a pair of window channel balances with part number 15 2 HN Caldwell on the back. I think the replacement is 16"395 channel balance 1520. would verify. Thank you
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Tom from SWISCO responded:
I can't say for sure if our Series 395 is right for you. The stamp only tells us how strong the spring is. The 1520 option is definitely the way to go, but in terms of confirming the Series, the only way to do that is to see how well our pictures and measurements match up to your existing hardware.
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