Coil window balancer

This coil housing reminds me of the 15-087 Coil Housing Pivot. To confirm if this is the correct replacement, carefully look over the specifications and compare them.

The compatible coil spring is the Series 180 Coil Balance, which is anchored to the window jamb using the 16-031 Mounting Bracket. Since your coils are marked with a 7, you'll need the S180-07 to replace them.

Detail of 15-087