Rubber for metal track inside top of window frame?

[Texas Tom]

I'm restoring a 1930 Briggs town sedan.

As seen in the photo, there's a metal track along the top of the window frame in the doors (where the top edge of the glass would be when the window is rolled up).

The other photo shows the edge of the rubber seal that comes with the window channel kits sold by vendors. This seal is to be glued to the top of window frame.

Since this rubber seal is not shaped to conform with and fit into the existing metal track, I presume the track must be removed before this rubber seal can be glued into place. Correct?

Does anyone know a source of rubber that's designed to install in the original metal track?

Thanks.