Legrand Pass & Seymour 302/304 S/S 3 Gang 2 Toggle 1 Strap Mount Blank Wall Plate, Stainless Steel (1-Pack) SS214 - The Home Depot
Smooth White 3 Gang Combo Wall Plate - 1 Toggle Switch, 1 Blank, 1 Duplex Outlet - Amazon.com
Blank Wall Plate Cover, Single Gang, Standard Size, UL Listed, Electrical Covers for Unused or Unfinished Outlets/Switches, White - By Revpex - Walmart.com