Commercial Electric 5 in. Mini Closet Light LED Flush Mount with White and Bronze Trims Fits 3.5 in. 4 in. Junction Boxes 7-Watts 650 Lumens 564361410 - The Home Depot
Surface-mount Electrical Boxes at Lowes.com
Flush-mount junction box - 48 series - GEWISS - IP40 / aluminum / with knockouts