The part that keeps the window open.

Hello,

I would recommend starting by comparing the (5/8") S600 and (3/8") S900 spiral balances for tilt windows to yours. The determining factor would be the diameter of the housing tube. If you need new pivot shoes as well, we would need to see yours removed from the window, as well as have you write out the exact width and thickness to compare to our inventory. Thank you! 

Thanks for getting back to us. The photos help but we would still need you to write out the exact width and thickness of your shoe since we are not able to make out exact dimensions from photos. 

We do offer the 15-173 pivot shoe with a depth of 9/16". Review the dimensions from our product page below to confirm it matches your part. 

Dimensions for 15-173