Non tilt aluminum window balance and parts

Hi there!

Thanks for reaching out to us. Based on these photos, your balance is a match for the Series 351 or Series 390, depending on the depth of the bottom shoe. Note that you only want to measure the metal channel to determine the length, and there should be a stamp printed on the back of the metal channel that represents the spring strength. 

Please let us know if you have any questions. 

Comparison of the S351 and S390 balance shoes.