Window Double Coil Balance Needed

I ordered 3 1/16" pivot bars (26-226) for a vinyl window double coil balance, and they worked like a charm. I have a window where one double coil balance is missing and the other damaged. The damaged one has 540 stamped on the coil, and the plastic housing has a capital A stamped on it. There are no other identifying marks, but I was wondering if it is enough for you to suggest replacement coil balances. If not, are there two others that could be installed as long as they fit those previously ordered pivot bars? The bottom window that needs it is 26 1/2"H x 29 1/2" W. I sent a picture of a mangled one that I have. Thanks in advance for any help.--Jim