Need help with balances and pivot bar

To start, your pivot bar appears to be part 26-021. Carefully review the measurements and compare them to your original to determine if this is the right part.

Alternate image for 26-021

Based on the way that your balance is attached to the shoe in the window, it appears that you have the S770-30 Channel Balance. To determine the stamp option, you'll need to search for any stamps/markings on the metal channel.

These balances are compatible with the 15-129 pivot shoes. To determine which, you'll need to remove the shoe from the window to confirm the measurements.

Detail of 15-129

Take a look at the video below for instructions on removing your shoes.