RACO 8232 2-1/8 in. Deep, 1/2 in. and 3/4 in. Side Knockouts, Welded 4 in. Square Electrical Box, 1-Pack, Gray - Electrical Boxes - Amazon.com,STEEL CITY 72171-1/2-3/4-E STEEL 2-GANG SWITCH BOX, 2-1/8,SCE-727224FSD - Saginaw Control and Engineering,3,3,