The stock seats fit into the car the best. The original vinyl upholstery is actually what makes them uncomfortable although thinking about it, the Euro cars with the leather in the same pattern are just as uncomfortable. Maybe it's just the original foam that is the problem? I don't know?
The ones that Hall does with leather and new foam make them very comfortable.
The Pantera cabin is so tight that virtually any seat other than the stock one causes an issues in another place.
The way you have to slide in and out, the seats with the side bolsters just make it more difficult, impossible to move your hips which you need to do and the high backs with the built in head rests block your view.
It is amazing how this car just punishes certain body types. If you are built like an NFL middle linebacker, the soft stock seats are by far the best fit but if you start to play with lowered floor pans and pedal spacing the couple of inches here and there are amazing. In my case I have an adjustable steering wheel height on the column and a quick release steering wheel hub too.
Those "little" changes transform the cabin immensely but then gives you other seat options.
In fact you can actually put a real non-deformed human in the passenger seat if you go to a flat or reduced engine bubble.
Why those weren't demanded by Ford back when is beyond me. Seems like some kind of a 'pay back' thing that was going on? Did they loose in soccer or something?
My advice would be to stick to a plan rather than try alternatives constantly.
I would also say that 'race seats' are not the way to go in this car for the street.