Find the best Peterbilt 389 parts in the business here at 4 State.The Peterbilt 389 is a big rig of choice for American truckers, with its dependable engine and great style. It's got all the features you expect from a Peterbilt model, plus many modern bells and whistles. 4 State Trucks can help you make your Pete 389 look like a million bucks. Whether you need aftermarket bumpers, exhaust, or seating, we've got you covered. Hit the open road in style and comfort with the best custom gear for your Peterbilt heavy duty truck or 18 wheeler.