My impression is that AJ’s bodies had more of a standard step. The steps on this body are more similar to the Bobcat/Parkette designs. However, I think this is similar to some other bodies built in the midwest by a yet-unidentified manufacturer years ago (probably some entrepreneur or small shop).

https://www.facebook.com/groups/WillysSwapMeet/posts/3707336706206248/

“Very nice fiberglass body tub for a flat fender Willys Jeep CJ2a CJ3a. Believed to be an AJ’s body. Asking $1,200 or best offer.”