Pivot shoe and coil balance

The pivot shoe you show resembles our 15-141, but I'm afraid the coil springs that go with it have been discontinued. The manufacturer recommends our 15-140 pivot shoe as a replacement, along with a 15-143 and 15-144 bushing and cap. Your window is only using one coil spring on each side of the sash for your 17 lbs. window, so I recommend the S150-8.