The Wix 51324 oil filter is specified for the 4D55 2.3L turbodiesel Ram 50. O'Reilly carries them, likely not in stock at your local shop and need to special order:

https://www.oreillyauto.com/detail/c...ter/wix0/51324

BTW, that is also the largest Wix filter I could identify as suitable for the 2.6L 4G54/G54B, 2.0L 4G52, and 1.6L 4G32/G32B gas engines (a size upgrade from the Wix 51381 normally spec'd for those engines).