That's a neat find.
The picture you are referring to with the seatbelts attached is from the iA, not the iM. Scion goofed on that picture. Look carefully at the headrests. They are not the same ones found on the iM.
The second goof they made was with the audio info. Yes, the iM has a 7" screen. However, the screen isn't mounted on the dash as the picture shows. That's the screen found in the iA.
It's really hard to believe that something official from Scion has those goofs on the same page. They can't even get their own info right.
I bet there will be some people that will install a flip out double din dash right below the hvac controls. Aside from that there really isn't anywhere else ideal mount one.I did notice the audio screen. Was wondering about the seats being another mess up. Can't stand that audio that will be in the iA. Never actually spent time with it, just don't like the look and the idea of never being able to upgrade the receiver without major work.