Buyers Products 2.5 Inch Round Marker/Clearance Light with 4 LEDs is used on trucks and trailers to meet FMVSS/CMVSS 108 regulations. Lights are available with amber or red color lenses. They have a PL-10 style connection. Lights are available in bulk (in multiples of 10) or individually in kits including a plug and grommet. They are backed with a limited lifetime warranty.