Does your machine have the hexagonal shafts or the round one? If you have the hex shafts, I might have a spare hard floor set. I know that I don't have the carpet brushes.
The 5460 has a smaller housing that are formed around the brush profile. I suppose you could call that "mickey mouse ears". I don't have spare brushes for your model. I've seen your type of brushes listed on Ebay from time to time.