I have a Ford 101 just like GWDixons (of course not as pretty!). What depth wheel are you guys talking about? The wheel on the rear is a rolling landslide, that engages the wall of the cut furrow. It may help a little to control depth but also adds lateral stability. Depth ( in my opinion) is mainly controlled by the three point hitch position. Guess I don't see the need for a wheel and tire like on the other picture. Why do you need depth control? Or are you looking for or to fabricate a rolling landslide? When I restored my plow, I bought a new one (the rear landslide or "wheel") but it cost over $100. The plow would probably work adequately without it. Lots of plows don't have them.