Side Window Replacement Tips?
 

Good day all. I have a 336 undergoing extensive annual now. Interior is completely out and I'd like to replace the side windows. I know the windows are the same as early 337s, but not sure if the window frames are the same. The rear window has two screwed in frames, so that is an easy replacement. The middle side windows have a screwed in frame at the top and riveted side and bottom frames.

My question is can the middle window be removed/replaced by just removing the top screwed in frame? Doesn't look like it will work without drilling out one of the riveted side frames. Does anyone have any advice or experience in the best way to remove/replace middle side windows? Thank you.

David