Unless you plan on doing a "run-in" of the brushes, you won't get 3 years of service out of them. You'll be disappointed when it turns out you need brushes again so soon....
Yes, the seals are for the pitch change ass'y. Those and the grommets can be purchased from Byam Propeller in Ft Worth TX, or Ottosen Propeller in AZ, whichever is closer to you. The grommets should ...