It could be original to your car. "Correct" kind of depends on how you look at it. Ma Mopar had a way of using up the previous years parts before using the new stuff. Production for the new model year started in August, so an early August built car very well might have some pieces from the previous model year.
My 8/17/71 built '72 model Challenger has '71 window mechanisms, a '71 style fuel tank, and a few other little carryovers that were supposed to be different on the '72 cars.