window door seal front side felt?

[kimeccles]

Hi,

This picture has the wind lace retainer on the left which helps seal the door window on the rear side. The other chrome part has a small slot maybe a bit less than 1/8 inch wide, and something like 1/4 or maybe longer that I think is supposed to have some weather strip felt like material glued into it.

Any ideas of where to get the felt for the one on the right, or what is really was to restore it right?

Thanks