Red Dot 2IHE Device Outlet Box Extension Ring, 2 Gang, 4-5/8-Inch Width by 1-Inch Depth by 4-5/8-Inch Height, Silver - Outlet Plates - Amazon.com
BELL 2-Gang Gray Metal New Work/Old Work Standard Box Extender Wall Electrical Box in the Electrical Boxes department at Lowes.com
Cooper Crouse-Hinds TP7123 :: Weatherproof Extension, 2 Gang, 1" Deep, Aluminum, Gray :: PLATT ELECTRIC SUPPLY
BELL 2-Gang Gray Metal New Work/Old Work Standard Box Extender Wall Electrical Box in the Electrical Boxes department at Lowes.com
Weatherproof 2-Gang Metal Extension Box Ring 8 Eight 3/4" Holes GRAY Outdoor | eBay
2 Pcs, 4" Square Extension Ring, Converts One Gang to 4 Square, 1-1/2 In. Deep, (6) 1/2 In. & (6) 1/2 & 3/4 In Knockouts, Zinc Plated Steel - Walmart.com
924081-3 Aluminum Extension Box For Use With 2-Gang Electrical Box | Imperial Supplies