Window Sash Balance

Hi there!

Thanks for reaching out to us. I can't tell if your bottom shoe is originally wingless or if the wings just broke off. If it's indeed originally wingless, I recommend the S351-26 or S390-26. You'll have to measure as shown below to determine the best match. You can also select the 2540 stamp option. A pair of balances with this stamp will support a sash weighing 19 to 25 pounds. 

Comparison of the S351 and S390 balance shoes.