Look at sourcing horsecollar style seats from a 73-77 Grand Prix, Grand LeMans or Grand Am. The GA seat frames have lumbar and passenger recline and they'll look almost correct. The seat tracks will not work in an F-body, though.
If you want late model seats, you could stick in almost anything. Avoid the ones with air bags and built in seat belts if you want to make it easier.
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77 Can Am W72
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