72 Demon seat backs?

I made a post asking if anyone had put in Honda Accord or similar modern seats in their cars. No one seemed to be helpful and a few were pretty critical. I'm not really offended, but I do need some input regarding the matter. These are the seats I presently have in my car...the whole back is missing on both sides. What is it supposed to look like? Someone said modern seats look crappy in a classic car...in my mind they can't look any worse than this. For a few bucks I can put a modern interior as opposed to a big bucks, correct restoration on a beat up Demon.
Seriously though, I would like to eventually redo the seats, but I'm not sure what the back is really supposed to look like.

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