channel balancer for double hung window 36.5 inches x 49.5 inches

I'm not sure what you have, unfortunately. We have dozens of different balances with that stamp. It's not a product code or anything, it just indicates the strength of the spring.

It should also be noted that there are no repair kits for balances. Depending on the nature of the damage, you will very likely have to replace the entire thing.

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.