Window balance 1/2"×25" channel

Thanks for posting. See either our S351-25 or S390-25. The only difference between these two balances is the 'depth' of the bottom nylon shoe. The Series 351 bottom nylon shoe has a depth of 1", whereas the Series 390 bottom nylon shoe has a depth of 1-1/8". Compare with your old balances and see what you think matches best.

Once you know what balance to pick, you'll need to select a stamp option. Your stamp option of 2430 is for a window sash in the weight range of 15 through 19 lbs.