Just installed these on a 2005 GMC Envoy SLT 4WD and they are definitely a larger diameter than the stock smooth ride premium shocks, which are available from stock. I managed to start them without removing the wheels and without jacking up the car. Haven't tested the ride yet but they seem to fit well. ATTENTION: They only go in one direction. The top of the shock absorber is different on each side where the bolt is inserted. The flat part faces the interior of the car, the slightly protruding