You can't swap it. The pattern bolts on the bottom frame are different.
So, not that I don't believe this, but I'm just curious, are you really saying they drill different body mount holes for bench vs captains?
This would seem crazy to me in a mass production scenario. They usually make the bodies so these parts can just be used one way or the other. It has to be something like the mount points exist and you just need a different seat frame mount or something, which, presumably, can also be bought or acquired from a crashed vehicle.
Otherwise, think about the engineering costs to produce 2 distinct unibody frames with different mount points... I just don't believe Ford would do that in this day and age, or maybe I am misunderstanding.
Thoughts?