New shoes for Alliance Window

With your part still being installed in the window, I can't be definitive with my recommendation. At first glance, it looks like it could be either our 15-111 or 15-191, but again I can't be certain. You will need to remove the shoe from the window to carefully compare your piece with ours. I am also going to place a video below showing how to replace a coil shoe. Perhaps this can help you when replacing your pieces.

The shoe isn't what keeps the window open, it just connects the coil spring to the sash. If the issue with the window is that the sash isn't remaining open, then you need new coil spring entirely. 

The 15-191 pivot shoe is compatible with the 1/2" thick Series 160. This should match up with your old spring, but you should remove one to be sure. You'll need to anyway, since you have to match up your stamp with our Series 160 weight options.

Yep, those stamps tell us exactly what we need. Assuming that these springs are 1/2" thick, that would be the S160-5. These have 5.5 pounds of support.

The cover we provide for a 1/2" thick triple coil system is our 15-150T. You may also find the video below to be helpful.

That's right. Though, keep in mind you only need to replace what's damaged.