Balance identification

We should be able to help, though you have an old discontinued hinge window and your balances will have to be custom made. They're also a bit involved, so we will need you to specify some information.

First, there's a chance each balance on either side of your window have different stamps. You mentioned that one reads 2530, but not the other. Stamps are indicative of spring strength so this is important to know.

Next, these balances are asymmetrical. What this means is that the nylon attachments on either end of one balance should differ from the other. In your case, one balance should have the 19-008 top and 15-025 bottom, but the other balance should have just the 19-008 top and no bottom at all. I will need you to specify which combination goes with which of the aforementioned stamps.

Finally, please tell me how many of each you need.

Hopefully this all makes sense. Let me know if you need clarification.