Yours is a Wheel Horse original for the slotted Wheel Horse hitch, hard o say whether it was made by Brinly, Ohio Steel, or Wheel Hose themselves. The other plow is a sleeve hitch plow and most other garden tractors used this type of implement, because like a 3 point lift patented by ford, the attachments would fit all tractors. The other excepts are Gravely and Sears/David Bradley. Gravely implements were most often brand specific and would not fit other machines. Most of the Sears/DB stuff was a modified narrower Cat 0 three point lift, but instead of being 19-20 inches between lift bars the Sears/DB hitches were 12". They also featured a different style top or center link. Often people will attempt to use Sears/DB stuff on Cat 0 lifts and it doesn't work unless you modify it with proper re fabrication.