Hope you don't mind me tagging along on the end of your topic, Henro, but I didn't see a need to have a bunch of topics on guage wheels and rear blades. It makes doing searches more complicated I think.
Anyway.... Here's a series of pics on mine that I just finished up. They came off my Woods rake and rather than just using the wheels, I used the tubing they were mounted to so I could still use the factory height adjustment. This also allows me to move them from one side of the blade to the other depending on what I'm doing or what works best. That's also why you see another set of holes. They were the factory holes for mounting to the rake. I drilled new holes to get the wheel closer to the blade and it also keeps the height adjustment more constant when I move it to the other side of the blade. I also mounted the wheels to my brackets using hitch pins rather than the bolts. This gives it some play and I could reduce the play if I welded another piece of steel to the top of the "U", but it doesn't seem to affect anything.
The pics show my normal position for the blade. I drive over light snowfalls and drag the snow, when it's heavier or we had some serious drifting, then I push the snow and drive in reverse.
Just another approach to the same results.