Window balance
Thanks for reaching out! Your balances appear to be the discontinued crossbow style balance. The good news is that they can potentially be converted to our Series 795 Channel Balances.
To confirm that they will be a situatable replacement, you'll need to obtain a few measurements from your existing balances. You'll need confirm the length of the balance as well as the diameter of the balance spring/channel. This diameter should be 1/2"; but let me know if it is 3/8" as this will need to be a custom assembly.
Please also confirm the width of the bottom T-shaped attachment (it will either be 1" or 1-1/4" across the bottom of the T shape) as well as the exact weight of each window. We'll need this to select the correct stamp option.
Take a look at the video below for instructions on this balance conversion and the information you'll need to determine the correct balances. Feel free to reach out with any questions you may have.