Trying to identify the balances for the windows

The windows do not tilt



Hello! We may be able to help, but I'd like to see more photos of this balance. Your last three photos here show the top end, but I'm more interested in the bottom end. I specifically want to see the end of the tube/spring and the bottom tip of the spiral rod itself.
Since this is a non-tilt window, I'd also like you to show me whatever bracket or clip is used to connect the spiral rod to the bottom corners of the sash.
Non-tilt spiral balances are difficult to get a hold of these days. Many models are just too old to get a hold of anymore. I will do my best, of course, but I thought you should know that now before we proceed any further.