There is no shortage of car models in the auto industry these days. Some models have gained followings while others have become flashes in the pan. Then there are the titans of the business, the models that have lasted the test of time and have been around, literally, for generations. In the course of their respective lifetimes, these models have evolved in more ways than one, none more evident than their designs. These seven models have been around for so long their designs have evolved considerably from when they first came out. Knowing their place in the business, these models are unlikely to go away anytime soon.