From looking at the interior picture I see the bench seat mounting holes are plugged and the holes where the bucket seats were mounted do not have the reinforcement plates that the factory used to help support them on the floor. My 74 Dart sport had a bench and the holes for the buckets were marked but never punched out and there weren't plates in the locations.

I would say the bucket seats were not factory and i don't see any console mounting brackets on the floor so the shift knob is probably a mistake