Few had ever heard of a crossover SUV before 2003, when the BMW X3 was released. Now every major manufacturer (at least the ones that want to make money) produces one. Everything you'd expect from a BMW is on display with the sleek, functional X3, so treat it right. When it's time to make an upgrade or addition, consult the following list. It is jam-packed with parts and accessories custom-fit to your BMW X3. Keep the generic and universal away from a machine of this caliber. Do your homework, and give it the fit it deserves.