Help me find a replacement part

Thanks for posting. This is called a channel balance. I'm sure we can replace these for you, but we'll need to see one out of the window, with clearer pictures of the nylon attachments at either end as well as the stamp code along the metal channel. The length of the metal channel, not including the nylon attachments, would also be useful From there, we'll try and narrow down what you need. For removal and replacement help, see the video below.