Non-tilt coil balance

Thanks for reaching out! It appears you have the 15-103 Quad Side Load Carrier. To confirm that this is the right fit, carefully look over the dimensions and compare them to your existing hardware.

Alternate view of 15-103

Alternate view of 15-103

This carries is compatible with the Series 145 Balance Spring. The spring in your photo appears to be with stamped with a 5, so you'll need to the S145-5 to replace that one. You'll need to check the other springs for any stamps/markings to determine if they are also 5lb springs.