The Dometic 3108398.011 Heavy-Duty Torsion Assembly is intended for use Dometic 8500 and 9000. Left hand side only. Millions of people around the world buy and use Dometic products. They’re RV users, boat owners, truck drivers, campers, outdoor people. And all part of a growing movement – a longing for freedom and adventure, a desire to explore the world and to stay away for extended periods of time. We call it mobile living. Our mission is to make mobile living easy.