coil balances 4 different windows.

Hello,

Unforutnately, we do not carry an exact replacement for your coil balance pivot shoe but our 15-199 Pivot Shoe should work well as a replacement. You'll need to compare the dimensions below to yours to confirm that this would be a good fit for your window. You mentioned that your shoe is 9/16" thick. Note that our part is a tad smaller at 17/32" thick.

Alternate view of 15-199

This pivot shoe is compatible with either the (1/2") Series 160 or the (3/8") Series 165  coil balance springs. To determine which series you have, you'll need to confirm the width of your coils. Then you'll choose the strength options that correspond with your original coils stamps. 

If you need new pivot bars as well, see the 26-378 below. Thank you! 

Alternate image for 26-378

There's a good chance that the S160-7 coil springs would work for your window, which support 7.5 pounds each. With that being said, we would need to confirm the exact sash weight for all three windows to confirm the correct combination of coil springs.