Joe & Greg,
This was originally built for Don Sweet by a gentlemen from NJ, I just acquired it after the fact. But, we are manufacturing our own schroud that will have a square bottom flange.
What I was told by the original manufacturer is that he didn't like how the schroud just pushed the snow instead of feeding it into the blades. That is why is cut the square portion off???
Our schrouds are a little thinner that way the blades will cut the snow pack and throw it out a good distance.