Rats, the ad is pulled before I even got to look at it.
It's usually the other way around, the '64 hearse could have '63 tail lights and bumpers on it. They started with a '63 commercial chassis and body made sometime in '63, then sent it to the private coach builders (Superior or Miller Meteor) where they make it a hearse. That could take 6 months or so depending on how many orders they have, so by the time they are finished, it is already 1964, so they just call it a '64 hearse since it is technically brand new and finished in '64.