I'm getting some cooling system parts over the winter for some maintenance work before the show season starts up. One item I need is the radiator cap. I'm all stock under the hood and want to stay that way with what Mopar parts are still available. I know sometimes the pricing and availability will cause me to go aftermarket but trying to keep as much oem replacement as possible. I went to the various online Mopar parts catalog sites and using the VIN it brings up two different radiator caps under radiator components part#'s 52079880AA which specifies that it fits the 2.5,3.7, 3.9,4.7.5.2, and 5.9. Scrolling further down in the same category it lists 5278767AB which just says 5.9. The photos look the same but don't know what the differences is. On my cap I guess the original cap it has 4592098 which I don't see anymore. So which Mopar cap should I get?