PaPow these pics show the (std. factory) mounting points. They sell the end plates as an option but I did not see the use of them until years later. I very much underestimated how much snow they can carry. These are obviously removable but I like it so much for certain areas like my pretty big firewood area along with all around the shop building that I keep them on and built another angle plow for the driveway plowing. This particular blade is a "trip edge" type and the tripping action is fully functional with the end plates, although I don't remember ever tripping it. It may be the skid shoe's on the end plates.
Rusty, that is a really sweet pusher. So are those side plates original to/for the plow or did you build those... i like how they`re made. I think if that were my rig, i think i would add a top plate back scraper cutter to the front leading edge so that you could flip it forward and get up close to back drag with it in close quarter areas.