Window Balance 26 5 LU CMC 1

Hey there! Thank you for contacting us. My recommendation is the S380-27 or S385-27. It looks like your bottom shoe is broken so you'll have to measure an undamaged version as shown below. That's the best way to determine which Series is best for your window. You'll also want to select the 2650 option based on your old 26 5 stamp.

Comparison of the S378, S380 and S385 balance shoes.