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It is a bottle jack. Should have a home in the base for a mounting screw to go through it and attach to the floor. Look for a corresponding hole in the floor on the right side behind the seat.
Well, I guess I was wrong about this one, but thinking about it, most of these trucks didn't come with a rear bumper so they couldn't have used a bumper jack. Mine has the hole in the center of the base and the base is not flat, sort of rounded up on a four sides, but I do know ford used a lot of different suppliers. Thanks for the enlightenment.