Challenger Under Seat Sheet Metal

Saw a thread here about seats and someone posted a picture of a vert floor with dubble hooks for the bottom seat.
What was the deal did they realy need dubble hooks?
The bottom part of the seat is the same frame as a normal Challenger just the back is smaller.{with the exception of the seat covers}
Also are the square boxes for the back portion of the seat in the same place?
I just bought a new AMD section

Yes, Conv E Bodies are like that, with the double hooks.

I think that the Conv. seat hooks farther forward, so the relocated as in double hooks.

Looks like where the back section bolts on the lower mount sticks out further also.