Arlington | Fan/Fixture Box with Adjustable Steel Bracket and Plastic Box
Westinghouse 15.5 cu. in. Retrofit Ceiling Fan Saf-T-Brace 0110000 - The Home Depot
Raco RETRO-BRACE Bracket Mount Retrofit 4 In. Ceiling Fan Box - Parker's Building Supply
4” Octagon Fan Box, 2-1/8” Deep, with Bracket — Primus Cable
Arlington FBRS415-1 Steel Fan and Fixture Mounting Box with Adjustable Mounting Bracket, For New Construction, 16-24-inches, Metallic, 1-Pack - Electrical Boxes - Amazon.com