Make sure your safety, air, and electrical parts are up to your top-notch safety standards by shopping for aftermarket parts at 4 State for your Peterbilt 330. We offer a large selection of top quality aftermarket parts so you can find everything you need in one place. Shop for electrical wiring, safety flags, roadside gear, airlines, and more for your Peterbilt. Ensure you are prepared on the road with help from 4 State Trucks.