2007 was the year that GM made the front lighting system to use a one-piece headlight and park light assembly. The Silverado and Sierra models are different from each other and now the Tahoe, Suburban and Yukon no longer share headlights with the truck models. On the 2500 and 3500 models this body style was introduced in 2007 (although there were some Classic models) and carried over through the 2015 model year. The tail lights for the Tahoe, Yukon, Avalanche and Suburban are different than the trucks on this generation of GM models. The other thing to pay attention to is that the taillights on the GMC Dually model actually use the Chevy tail lights. All the other Sierra's use a different tail light than the Silverado models.