Replacement for 20132018 ATS XTS 3.6L Part numbers: 84198978, 13579168 Material and construction: LED unit lighting accessories are made from grade aluminum. Designed to withstand rough road wear and provide longterm durability Function and performance: Restores proper LED lighting for the vehicle and adds a brake signal to the traffic behind you when braking Why you need it: If your original LED unit is damaged or worn, this replacement maintains visibility and signaling, helping to keep you safe on the road Compatibility and fit: Specifically designed to fit the 20132018 ATS XTS 3.6L with standard mounting points Use scenarios Scenario 1: a failed LED unit on a 20132018 ATS XTS 3.6L to restore full lighting and braking signals Scenario 2: Upgrade a vehicle in a fleet to ensure consistent brake signaling visibility during night driving or in adverse weather Scenario 3: During a midlife restoration or routine maintenance to maintain safety and compliance with proper lighting functionality