coil balancer for Simonton window

Thanks for posting. I've received your pictures, but I'm afraid they don't tell me what you need. Could you remove your sash and show me a picture of the pivot shoe? The pivot shoe acts as a sort of key, and seeing it will tell me what kind of balance system you need.

This looks like our 15-199, which is commonly used with the Series 160 coil. Each coil in the Series is marked with a stamp that tells which weight to purchase, so look for that stamp near the end of the coil tongue.