1964 Dart GT convertible back seat

Would someone please share a picture of their Dart/Valiant lower back seat with me?

I have a newly purchased 1964 Dart convertible, but the back seat bottom appears to be about an inch away from the hooks in the floor. When I reach in between the seat back and bottom, I can feel that the seat bottom is hitting the vertical supports for the seat back on either side.

I also noticed that the top of the seat back doesn't have the hooks on it to grab the bar that goes across for the convertible well. I don't have a well liner, so I can see the back of the seat clearly.

My guess is that I may have a coupe back seat instead of the correct ones. Just curious what modifications I may need to make to get this setup to fit the car and be safe for my kids. It's either that, or I may need to push down on the top of the seat as it contacts that lower connection point to make sure it goes under there (second picture).

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not sure about the valiant setup but on a dart convertible the coupe,hardtop and 4 door seat back and bottom is too wide to fit between the side panels. I've got the wife's 66 dart covered outside and can take some pic's tomorrow. Mine (66 convertible) has been altered to use 96 Sebring convertible front and rear seats since I bought the car and it didn't have a rear seat with it.
the seat back is 3.5 inches taller and will require a new boot to be designed.
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I did have to peel the sides back a bit and shave 1/2" on both sides from the armrest pads to the top so the panels would let the top up and down correctly.

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fronts used 1 outboard hole in the front but I had to use brackets to the other 3 mounting points.
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here they are mounted in and checked. next on the list was bracing plates on the 6 mounting points that didnt hit the original supports.
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this was how I added the "non tunnel seat to my "tunnel" seat. worked good since I could hide the white plastic mounts scavenged from the sebring. plus it gives me an extra 5 inches of space to mount speakers in.
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