There should be an opening right behind where the license plate is on the inside. right near the latch. behind where the 3rd brake light for non Cobras are.
I think most of us have done somthing similar on a project and forgotten to take a picture of something and had to figure out how it goes back together some non-trivial amount of time in the future. I've never had to look at pictures/videos of cars online, ask around online, or visit a friend or junkyard to figure something out. No, never...
One of the reasons I never got around to installing my clutch cable/quadrant/adjuster - my big ass ain't fitting up under the dash, even with the seat out lol.
Thought I posted the successful conclusion to this forehead-smacker, but maybe didn’t hit “post reply”. I dunno, but it’s possible because there was a Jameson celebration immediately following! ;-)