2640w channel balance

Hey, Gianpiero! This looks like an S380-27 channel balance. Can you quickly confirm that the metal channel measures 27" and that you have the bottom "shoe" attachment shown below?

Alternate view of 15-005

The shape is irrelevant. Focus on the depth. What's the exact depth of your shoe? Small differences matter, so I cannot accurately read the tape measure in your photo.

That can be replaced, but you need to remove a section and show it to us end-on, like the angle in the drawing below:

Example illustration of a cross section.

I'm afraid it's impossible to identify weatherstripping while it's still installed. There are many, many types of weatherstripping that have similar shapes with only subtle differences. Seeing the end profile is vital. The only other thing I can suggest is to look over our complete selection here.