Bathroom window coil balance system

This coil spring looks like our our S190-740. Your pivot shoe might not need to be replaced, but if you want to do it anyway then I recommend looking at our 15-180. Also looks like one of the supports is broken so see our 15-181. Finally, just to round everything off, might be missing some bushings, so look at our 15-152 as well.

I'm not sure I understand your question. The 15-181 doesn't come with a coil spring, it's just a detent clip.

The parts that Paul recommended include the coil spring, pivot shoe, bushing, and detent clip, which are the only parts that I see in your picture. You only need to replace the parts that are broken; if any of them are undamaged, you can re-use them. If you have other damaged parts that need to be replaced that are not pictured, we would need to see them so that we can make a recommendation.

Don't worry, installing this hardware is very easy. The first thing you need to do is install the coil spring to the shoe with a screw, then install them both in the jamb. Once you're done that, put the bushing on the detent clip and place them in the coil springs, then screw the clip to the window jamb. See the video below for more information.