I can't answer that but FWIW I'm adding a 68 B Body buddy seat to my 65 Dart wagon. Besides the buddy seat, am using 66 Dart/Barracuda buckets (virtually the same as 67 A Bodies). The seats look just like the ones in my 67 Charger as well.
Im putting one in my 68 dart so I can make left hand turns. Its from a b body, dont know if I will have to do any fab work to make it fit between the buckets of the smaller a body. If not I'll sell it.