What I did for my 66 Coupe backseat when I reupholstered it was to buy some carpet padding at Lowes, I think I used maybe 1/2 inch, might have cost me about ten bucks.
I layed it over the bottom, cut to form, same for the seat back, used some 3M #77 adhesive spray to hold it down, instant new padding!
For as often as someone is going to use those seats, it should be fine, what you are really trying to do is bulk it up so the new upholstery doesn't sag anywhere.
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