It"s been a couple years since I saw the flat bars on the lift wheel, but as I recall they were the width of the wheel and about 1"-1 1/2" wide.
I do not think they were flat, but were bent U-shaped lengthwise so they had the 2 edges sticking up for more traction. But that shape could have been made by the plow owner thru the years....who knows what was done over so many years.
I also have seen a wheel with bolt heads sticking up for traction, with a nut on both sides of the wheel to lock them tight. I think that was an owner design.
I have a #4 on steel, but the left wheel axle is badly bent in; I think it might have been dropped off a truck as something violent had to happen to do that damage. I might take off the moldboard, the 2 handles, the hitch, the coulter, etc. and scrap the rest.
LA in WI