That is part of a mounted plow, we had a 3-bottom one like that on our A tractor. These were made by Yakima for deere. I cut ours up and used it for welding iron. The B would struggle with even a 2-bottom plow. Do you have the the plow that goes with the hitch? I don't think the hitch would work with anything else.
Thanks for the info. No I dont have the plow. I bought the tractor at an estate auction. Runs and operates great. I have a propane 50 that is beyond repair engine wise with front and rear cultivators. Thought about putting them on the B. I do have a 3 disc JD pull plow. Thought about selling all of it. My woods are fill of intended projects.