The twin iron pieces with the curved hooks, belong on the end of a wooden singletree. Which attached to the front of a wagon, part of the hitch assembly. The large double pointed piece looks like a double ended field cultivator shovel, not real sure on this though. The long cast iron piece with the hooked end, may be for the end of the shaft on a buggy, never seen any exactly like that. Clearly seen is where it was once bolted to a square wooden piece. The round collar with bolt holes, may be the clamp, holding the torque tube to the back end of a Model T transmission, or a car from that era.