Window balance for kinro 1500 series

With this combination of attachments, you could have either an S380-27 or S385-27 channel balance. You need to measure as shown below. The Series 380 has a 1" bottom attachment, and the Series 385 has a 1-3/32" attachment. You'll also need to read the stamp number on the back of your balance to choose the correct spring strength for the balance that you choose. Thank you!

Comparison of the S378, S380 and S385 balance shoes.