Window balancer part number
Your exact shoe is no longer available but the 15-177 Coil Balance Shoe should work well to replace it. To confirm that this is the right replacement, you'll need to remove your shoe and compare the specifications.
This shoe uses the 1/2" wide Series 152 Coil Balance; attached to the shoe using the 33-072 screw. To select the correct coil weight option, you'll need to look for a stamp/marking on the existing coil. If there are none, please see the tutorial tagged below.
If you cannot reuse the coil supports (covers), you'll need the 15-143 Coil Bushing, 15-144 Coil Bushing Cap, and 15-145 Coil Support Barrel. All are used together to create the support.