The Stovebolt Site Forums The Parking Lot Panels 'N Burbs Rear barn doors?

Forgive me for asking, The rear doors Barn Door type. Some say 47 to 55 are the same and some say 47 54? Is there something different about the 55 rear doors?

I have a set of rear doors and all the hardware, but not sure what year they are ? Other I know they are AD series. Thanks if you can enlighten me!