Coil for Advanced Window Corp

Thanks for reaching out to us. I thought this might have been our 3/8" thick Series 165 coil spring at first. The shape and size are similar. However, there are a few subtle differences between your spring and ours that makes me hesitate to recommend anything. 

Before we go forward, can you show me a photo of the pivot shoe that your spring attaches to? Pivot shoes sort of act as a "key" that lets us figure out everything else that goes with the coil balance system. That will let us be 100% sure whether the Series 165 is what you want, or if you do have something different after all.

Thanks! This was a huge help. I think you should be fine using our S165-6 coil balance. This should be compatible with your current pivot shoe and fit in the window track without issue.