coil balancer

I'm afraid I can't identify what balance you have by this photo alone. The first step of properly identifying a coil balance assembly is to see the pivot shoe they connect to. Would that be possible? I need to see it as clearly and unobscured as possible.

Thank you. We actually don't sell this exact coil balance assembly and as far as I know it's not made anymore. The good news is that we may have a functional alternative that may or less work the same. 

We sell its individual components separately. See our 15-191 pivot shoe, Series 160 spring, and 15-150S cover, assuming that you have one spring per side.

First, check the size of the 15-191 (shared below) to ensure that everything matches up. If yours is a different size in any respect, let me know.

Next, weigh your sash on a scale and divide that in half. That will tell you which Series 160 weight option would be applicable.