Al,
The model with the bench seat in the rear is the Coupe, or "California Coupe." It has no soft top; just a removable hardtop. Technically, it's a 2+2, but that's stretching it since the backseat has just an inch or two more than the normal Roadster.
The transverse backseat, aka "kinder seat," was seen on Roadsters (models with soft tops)throughout production. It is easily added or, if desired, removed. Cars with the transverse seat were delivered with the removable parcel shelf in the rear that covered the footwell on the driver side of the back seat.
IMHO, it's a neat option to have. I like the fact that you can stow luggage or groceries in the footwell and they won't move around.
Douglas Kim
New York
USA