The Bilstein 5100 Series Ride Height Adjustable Shock Absorber - PN: BIL24-187367 Fits the Dodge Ram 1500 2010-2009, Ram 1500 2018-2011, 1500 Classic 2020-2019. Please Give us a call, we need a little more information to get you the correct shock to fit your '19 Duramax. Sales & Support - 877-474-4821