Window balance

Thanks for visiting our website. Your balance looks similar to both our S351-30 and S390-30. The only difference between these two balances is the depth measurement of the bottom balance shoe. The depth measurement of the bottom shoe for the Series 351 is 1" and for the Series 390 is 1-1/8". Measure the depth of your bottom shoe, like in the diagram below, to determine which of the two balances would make the better match.