Mine on the 73 was pop riveted through the inner lip of the exterior door frame and then it is held in a slot with clips. It requires a gentle prying all along the inner door trim for it to come out of the door frame.
This website is not affiliated with or endorsed by the Airstream, Inc. or any of its affiliates. Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.