I know where you are coming from. I have an open 80 acre field on the West side of the driveway. After a snow the wind always picks up. Usually out of the NW. Drifts can be pretty big. I have had to bring in a big frontend loader a couple times over the years. Push the snow back 50 - 60 feet into the field. Driveway is 1100 feet. 900 open to the field. Just glad I have a wind break of trees growing on the north and west sides of the yard.
Sorry if I gave you the wrong idea. Belting does not go on the vanes, but on the paddles.
I think there are 2 paddles on your blower. Paddles are where the vanes meet in the center. The flat spot. Vanes push snow to the paddles, and the paddles throw the snow out the chute.
Not like the little walk behind single stage throwers that have rubber belting on the vanes and the flappers.
Attaching part of the drawing of your blower from Sears. I colored one paddle red.
The rubber belting bolts to the paddle. By cutting a piece of belting to make the paddle fit the blower housing tighter, it fills the gaps between the paddle and the housing and makes the snow go out more efficiently.
Reminded today it is also called the flapper mod.
I should also point out the 4" belting I bought the other day was not for or from the belt that runs off the side PTO on a large tractor. It is 4" replacement belting for one of the large hay balers. Called baler belt. Each of those balers has about 8 belts that wrap up the hay. See image.
Found a thread with some pictures dealing with a single stage thrower and the flapper mod. Has a couple pictures in it.
I am sure there are more. I know several people on MTF have done the mod and posted pictures. But I am not finding many except those where they used photobucket. And those are not viewable any more.
Thread here. Flapper on a JD
Here is another thread on a single stage Craftsman adding the flapper mod.
Note how they fit the belting up tight to the metal of the housing to fill the gap. Also note how they bolt metal over the rubber to hold it in place. Then drill through the paddle and bolt in place.
Your gap may only be 3/8" or so, but filling it will make a lot of difference.
Those that have done this really like the results. Especially on wet heavy snow.
When I was talking about buying a used one complete, I was thinking keep the best of what you have then put the other stuff, and your old blower up for sale to recoup some of the money you spent.