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Amazon.com: Arlington Industries Arlington BE1R Plastic 1-Gang Ceiling Box Extender 4.35 Inch x 1.5 Inch, Color : Everything Else
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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
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RACO Silver Steel New Work/Old Work Standard Box Extender Ceiling Electrical Box in the Electrical Boxes department at Lowes.com
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