The TYC 20-9142-90-9 Left Headlight Assembly is engineered to provide a reliable and precise lighting solution for the 2016-2017 GMC Terrain. This assembly is designed to meet or exceed the standards set by the Department of Transportation (DOT) and the Society of Automotive Engineers (SAE), ensuring compliance with the Federal Motor Vehicle Safety Standards (FMVSS) 108. The headlight assembly includes both high and low beam halogen bulbs, as well as front signal and side marker light bulbs, all pre-installed for immediate use. Constructed with a durable plastic housing and a clear plastic lens, the assembly is built to withstand various environmental conditions, offering longevity and consistent performance. The lens features a special coating that prevents hazing and fading, maintaining optimal illumination over time. Designed for easy installation, the assembly comes with OE-comparable fasteners and mounting tabs, facilitating a precise fit and hassle-free setup. Rigorous cycling tests have been conducted to ensure the assembly's quality and durability, providing dependable performance for the vehicle's lighting needs. This headlight assembly serves as a direct replacement for the original equipment, restoring the vehicle's lighting functionality to its original specifications.