Single Hung Sliding Window 15" Sash Balance With Wings need replacement as both plastic breaks broke

Hey there!

Thanks for reaching out to us. The S380-15 and S385-15 channel balances look like matches. You'll have to measure the bottom shoe as shown below to determine the best one. You can also select the 1460 stamp option. A pair of balances with this stamp will support a sash weighing 17 to 20 pounds. 

Comparison of the S378, S380 and S385 balance shoes.