2.5" RED round clearance/side marker light. TU-961R-1L
Industry standard 2-pin plugs, meets DOT FMVSS 108 requirements for use as tail lights. The light mounts with a compatible rubber grommet (sold separately). Each light boasts 10 high intensity LEDs operating at 12V DC that consume 90% less energy than incandescent lamps.
Plugin here https://www.larsenlights.com/2-wire-plug-pigtail