73 was a transition year for these tractors. we would have to know whether you have the old hook ups (holes in the frame where the plow mounts) or the new hook ups (the quick connect blocks sticking down from the bottom of the frame) before we can answer that question.
Never mind. I just saw pics of your tractor in another post. You have the old hook ups. Align the plow frame with the bolt holes of the tractor frame. Bolt it on and hook your push rod up to the bottom of the side swing bar for the hydraulics. You'll be ready to go. Mine all have the newer hook ups so I can't help you with any pictures.:sorry1: