Don't know which brand you are dealing with but this one says that's what they're good for
Dually 4 LED Flush Mount
Compact 2x2 Light
Available in: Amber/White LEDS
The Flush Mount Series of Single Row LED lighting from Rigid Industries is the perfect solution for creating a seamless light installation. Because of the depth of these lights, they work perfectly to flush mount into a rear bumper for backup lights, or to the body of your buggy for rock lights.
Looks like you'd be cutting some pretty big holes. And attaching to plastic and/or a backing plate
Here's the instructions for the backup sensors: