Window channel balance replacement

Thanks for posting. I am confident we can help, as this is a 26" long non-tilt channel balance with a stamp code of 2520 (which is equivalent to the 25-2 stamp on your old balance). I just need to see closer pictures of the attachments or nylon fittings on both ends of the metal channel. From there I should be able to fully identify the Series you need. 

Perfect, thanks. Looks like the top nylon fitting has no wings, or side tabs, as the bottom fitting does. In that case, this matches our S350-26 Channel Balance. Choose a stamp option of 2520.