'68 & '69 Plymouth Bs with an emblem in the center of the rear seat would be only the bucket seat cars. Deluxe had ornaments in the seat inserts. Base had no ornamentation.
black seats in the OP are '69 Belvedere or Roadrunner. OR base Coronet. In '68 I often rode around in a new '68 Coronet base model coupe whose silver & black seats were like my '68 base Roadrunner. I don't recall the door panels exactly, though. The door panel photo appears to show a different base design than the Plymouth.