Window balance spring

Question

I need to replace this 21" window balance spring. I don't know which option to select from your website. The only indentifying # I can find on it is 2020. Is this helpful info?

Bob · Accepted Answer

Thanks for writing in. See our S380-21 or S385-21. The only difference between these two balances is the 'depth' of the bottom nylon shoe, so compare both with your old hardware to see what matches best. You will need a stamp option of 2020.