Hubbell Raco 4 in. Octagon Box, Drawn, 1-1/2 in. Deep, Two 1/2 & Six 3/4 in. KO's, Raised Ground, Gray, (126): Electrical Boxes: Amazon.com: Tools & Home Improvement
Steel City 54151-1/2&3/4 Outlet Box, Octagon, Drawn Construction, 4-Inch Diameter by 1-1/2-Inch Depth, Galvanized - Electrical Boxes - Amazon.com