Eric '63 Crown Four-Door '63 Belvedere Four-Door sedan '72 Newport Custom sedan
The parts book calls both of them "mufflers", and they look like mufflers to me. I looked under my '66 Coupe barn find, and there's a pair of mufflers under there. In addition, the line drawing in the FSM clearly shows mufflers. I think what the factory was trying to tell us is when the exhaust is done correctly you don't need resonators.