I've got two 4' sets of that rear blade. Got them at an auction. My local maintainer guy said they use those in the spring when they work the roads up for dust control.
I'd fabricate one up, but I'd probably never use it. I've got 150' of driveway that's pretty easy to keep nice with what I have.
I just like mechanical stuff. Kinda like a woman liking purses and shoes!!