Thank you, Smokey, but that didn't answer my question.
To be more precise, I presently have "Standard" front seats.
What will be required if I want to convert to "Deluxe" seats?
Different frame, different foam? What?
The question is that my interior was pretty gutted when I bought the car. I've now acquired a "Deluxe" rear seat.
So, I have a mismatch, and I'm deciding which way to go, Deluxe throughout or Standard.
The Deluxe rear does not need upholstery; the front does.