Channel Balance numbered 2930 and 2950 on the old Balance

I'm not sure what you have, unfortunately. We have dozens of different balances with those stamps. They're not a product code or anything, they just indicate the strength of the spring.

In order to figure out what Series this is, I need you to remove an undamaged version of this balance from the window and show me clear pictures of the top and bottom nylon fittings. I will also need to know the dimensions of these fittings.