I would say the rear seats would be the same but not sure as I only ever owned sedans.As to the front seats it will be like finding a needle in a haystack as all sedans had bench seats up till 1969,the only models that had buckets prior to 1969 was the Deluxe,1600S Coupe and sedan and the GT model.
OSJ would be the man to ask on the rear seats as he has or had Shovelnose Coupes.
Cheers Brett.
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