15" long spiral balance with 3/8 diameter housing
Hello,
If your balances are from a tilt window, take a look at the 3/8" diameter S900-15. It looks like your balances may have red tips, which would correspond to the red tip option for the S900-15. Take a look and let us know if you need anything else. Thanks for posting!
The spiral tip shown in your photos matches the S900 for tilt windows. Could you show us the part in the window the spiral end attaches to when installed? That would help us confirm the type of balance you need.
Perfect! Your photo shows a pivot shoe, which is exclusively used in tilt windows and allows the pivot bar in the bottom corners of the sash to tilt inward for cleaning. Based on the photos and dimensions you provided, the S900-15 red tip balances would be the correct replacements.