Window balance

Thank you for reaching out to us. Your balance looks like a match for the S378-25, S380-25, or S385-25. The important difference is the depth of the bottom shoe, so you'll have to measure as shown below.

The 24 9 stamp is from an older rating system so you will need to weigh the window sash to determine the correct stamp option for the new balances. There's a chart under the balance's product description that will tell you which stamp is best based on the sash weight.

Please let us know if you have any questions. 

Comparison of the S378, S380 and S385 balance shoes.