General description The Tail Light Bulb LED Unit Tail Light Control Module is designed to replace part numbers 84198978 and 13579168. This brand new rear LED unit is compatible with Cadillac ATS and XTS models from 2013 to 2018, specifically for the 3.6L engine. It provides enhanced illumination for improved visibility and convenience, ensuring a perfect exchange with previous units. Technical specifications Interchange Part Numbers: 84198978, 13579168 Color: Black + Silver Material: Metal Measurement allowed error: +/- 1-3 cm Installation Easy to install and use. Usage Provides illumination for visibility and convenience. Other information Package Contents: 1 x Tail Light Control Module Note: Light shooting and different displays may cause the color of the item in the picture to differ slightly from the actual product.