Sorry I don't think I can help but from the attached picture, which seal are you asking about? The horse shoe that goes on the door frame (top right) or the long skinny one that is attached to the side glass (bottom left)?
DEJ's picture is incorrect. The seals should mount from inside the 1/4 facing out through the opening. The screws go in from the jamb side, through the holes in the panel and into the seal. On the ones I have the "LH" marking would be inside the panel facing rearward.
Gary
__________________
72 Nova SS - Minitubbed 70 Nova SS - #'s L-78 Bench Stick 68 Acadian SS clone - factory air 67 Chevelle rag - SS 427 clone
Glad you got it sorted out as I've never owned an earlier than 69 A body. The pic I up loaded was just a generic one I found when I did a quick search to help confirm which seal you were talking about.