iMBAPrice BE1R 1-Gang 4.35-Inch x 1.5-Inch Plastic Electrical Ceiling Box Extender for 3.5" and 4" Round or Octagonal Boxes - Amazon.com
RACO Silver Steel New Work/Old Work Standard Box Extender Ceiling Electrical Box in the Electrical Boxes department at Lowes.com
Smart Fill Spacers 3/8 in. 1-Gang Outlet Box Spacer Extender (5-Pack) SG38-5 - The Home Depot
RACO Steel New Work/Old Work Box Extender Electrical Box in the Electrical Boxes department at Lowes.com
Bell+Howell SocketFan LED Light & Fan - Town Hardware & General Store
iMBAPrice BE1R-2 (2-Pack) 1-Gang 4.35-Inch x 1.5-Inch Plastic Electrical Ceiling Box Extender for 3.5" and 4" Round or O - Walmart.com
Steel City 1-Gang 3 1/2 in. New Work Pre-Galvanized Metal Octagon Electrical Box Extension Ring (Box/Conduit/Fitting Accessory) 2515112-25R - The Home Depot
Carlon Multi-Gang PVC Electrical Box Extender (2-Pack) B1MGEXT-2 - The Home Depot
Ceiling Fan Rod Accessories Extender Downrod Extension White Fans Pole Long Hook
Ceiling Box Extender at Menards®
Steel City 4 in. 1-1/2 in. New Work Deep Pre-Galvanized Metal Octagon Electrical Box Extension Ring 551511234-25R - The Home Depot
ReceptXtenders Receptacle Outlet Box Extender, Electrical Outlet Extender for Electrical Box and Electrical Outlet Switches, UL Listed – 1/2" Two Gang 5-Pack - Amazon.com
Arlington Industries Box Extender (2-Pack) BE1-2 - The Home Depot
3 Gang Electrical Box Extender Goof Rings Add Up to 1.5'' Deep
iMBAPrice BE1R-2 (2-Pack) 1-Gang 4.35-Inch x 1.5-Inch Plastic Electrical Ceiling Box Extender for 3.5" and 4" Round or Octagonal Boxes - Amazon.com