Compatibility:Compatible with GMC Sierra 1500 Denali / SLT / AT4 models only 2019 2020 2021 (Not Fit Elevation / SLE / Base models) Function:The fog lights are built to withstand harsh weather conditions, including moisture, dust, and vibrations, ensuring long-lasting performance and reliability. Enhance Visibility:The fog lights are designed to provide enhanced visibility during foggy weather, during nighttime, heavy rain or snow reducing glare Advanced Technology:Manufactured by advanced technology and implemented strict quality control measures, ensuring excellent performance and quality OE Standard: Meets the Original Equipment (OE) standards, ensuring replacement fit just like the original. Interchange part number:GM2592331, GM2593331, GM1038242, GM1039242, GM1038258, GM1039258, LED Switchback Fog Lights Compatible with GMC Sierra 1500 Denali SLT AT4 Models Only 2019 2020 2021 (Not Fit Elevation / SLE / Base models) Switch+Bezel