Does anyone know how this black sweeper seal is attached?  It’s attached on the inside surface.  I can’t feel any mechanical connectors.  Is it glued? Fit in to a slot?  Any help would be appreciated.  It needs to be replaced.  Also, how is the white seal around the outside perimeter attached?  Seems to be glued, but I don’t want to start pulling on things until I know.  Last question…where can I purchase these seals?