Hello,
Take a look at the (3/8") S900 or (5/8") S600 spiral balances for tilt windows. The determining factor would be the diameter of the housing tube.
As for the missing pivot bar, there's a good chance that we can help but we would need to see an intact pivot removed from the other side or an identical window to compare to our inventory. See the videos related on this page to assist you in the meantime. Thank you!
Thanks for getting back to us. We can't be sure with the part installed but your photo resembles the 15-178 or 15-188 pivot shoe. Review the dimensions below to determine the correct match.
We also can't confirm the pivot bar that you need based on a damaged part but these pivot shoes are commonly used with the 26-226. That doesn't necessarily mean that is what you have but it is a good place to start. Take a look and compare the dimensions below to an intact version removed from the other side or an identical window.