351-25 Channel Balance - Need help identifying the part that connects it

Thanks for contacting us, John. This isn't our 19-002. The 19-002 is a nylon fitting that is riveted to the top of a balance. What you're showing me here is a top sash guide, which is a different part that screws to the top two corners of the sash. Specifically, it looks like our 18-110.

I recommend watching the videos I've related to this page to get an idea of what these parts are and how they work in relation to each other. That should clear things up for you.