It is a very rare and highly sought after option.
My 73 340 Duster is an ultra rare one of none reclining bucket seat car that also has a fold down backseat
Had a girlfriend once who had a big old Cadillac Eldorado that had the fold down leather seat option! Man, that car was a rolling love nest!! All of the seats folded down to one big flat leathery pad!!! Man, I miss those days!! Geof