The blade fits a 1972, then it will fit any Lo Pro 200 Series from 1971 to 1988.
It will also fit all of the 3000 Series from 1989 to present day.
The above is based upon your blade being a J-Series or later that has the lift arm going UNDER the front axle.
If it has the lift arm going OVER the front axle, then you may encounter some interference on a 226 with the Onan engine. However, there should be no problems with any Kohler powered model.