A handy person from Anza says:
On the rail itself it has the number stamped into it 2340c. It looks to have a "v" shape on the top part and yours does not. It could easily be filed to match I suppose as long as it functions and fits. If you need me to take it apart I will have to drill out the rivet so let me know if you need that.
User submitted photos of a window balance.
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Tom from SWISCO responded:
I'm not sure what Series balance this is without seeing the bottom shoe, as well as knowing the bottom shoe's dimensions. Let me know if you can get those to me.

As for the top attachment, it looks a lot like our 19-002. I don't think the different shape matters, since it's only a small difference. This is a very simple piece of hardware and it only needs to catch the take-out clip. As long as it can do that, it doesn't matter if it has the V indent like yours.
A quick learner from anza says:
Thank you that is all I needed
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