The small trim pieces used from 1947 to mid-49 were attached to the small tab shown in picture two. These tabs are part of the inner windshield trims and were eliminated when the change was made to the small flat cover.
https://www.flickr.com/photos/advance-design_parts_co/8129177743/in/album-72157631867396207/
https://www.flickr.com/photos/advance-design_parts_co/8331300940/in/album-72157631867396207/