24 inch measurement

Your balance bottom shoe looks to be 1-3/32" in depth. Measure up, and see if it is. If so, you can use our S385-24 side-load balance. Our balance top does look different than yours, but it should still work for your window. The spring weight option would be 2340, thought you should be sure to weigh your window sash and check. 2340 is the right option for window sashes weighing 18 to 23 pounds.