Does anyone know a source for window channel felt? My windows are very loose in their channels. I believe this may be contributing to the incredible wind noise I get from the tops of the closed windows, despite having replaced the body-mounted door seal and despite the fact that I seem to have good contact between the seal and the window when the door is closed.

I recall from replacing one of the window regulators that the window channels can be removed, so replacing the linings should be fairly straight forward.