I have a 2004 1500 with 5.7 and it has the same NON pressurized coolant reservoir (52028836AB) as the OP. After some research I've found that the early trucks could have came with this setup but it was replaced with a setup that combines the coolant reservoir and washer fluid reservoir into one unit (5072595AA, 55056502AC). Both of these parts have been discontinued by Mopar, and only the combo unit is available "new" in the aftermarket, Dorman 603-092. If your truck came with the smaller stand alone unit, you can replace it with the combo unit. If you look on your fan shroud there are unused mounting holes. Also note that this is only for 2004 and newer trucks. Apparently the older 3rd gens 2002, 2003, used a pressurized coolant reservoir (black top) and is not interchangeable with the later years.