'65 Fastback Rear Seat Installation

[Sbattles]

Ok, there's 3 panels for the rear seat. Moving from the front seats towards the trunk, the first panel is a 90 degree angle. The second panel ends up being the seat back when in the up position. The third panel is stationary. It's the closest to the trunk. That's the one I'm trying to figure out how to install.

I see on the bottom of this panel various bolt holes as well as having two thin strips of metal (look like sheet metal maybe 2" wide x 4" long). These look like they slip under something in the floor? Maybe I'm missing some brakets?

I'm just trying to figure out how this panel attaches to the body. Right now all she's doing is floating.

Any help is appreciated.