The image you had with the 80/20 cockpit is a former F1 seat. You won't find on like that. The tillet would be your closest, I mean they put those in Radical's and other endurance/layback race cars. Other than molding a seat, your options are few and far between. If it helps your search, I've been looking for a f1 style seat for YEARS and haven't come up with anything other than molding one or spending the $1000 on a tillet. Supposedly super comfortable though, no padding necessary, plus takes away the "feel" of the car.
Just trying to help.