I found a few plows, a few Ferguson plows and a few Dearborn plows. There are two I'm interested in, one a 2-12 Dearborn plow.
https://semo.craigslist.org/grq/d/farmington-dearborn-12-turning-bottom/7281285920.html
It has a very bent rolling landside trailing wheel. I'm not sure how hard the wheels are to get, or how hard it will be to straighten the one on it. It's bent very bad and probably will require heat to straighten.
The other is a 14-AO-28 Ferguson plow.
https://stlouis.craigslist.org/grq/d/farmington-ferguson-14-bottom-plow/7281275117.html
Are the rolling landside wheels hard to find?