If your talking about the regular WK2, for the Hemi 5.7 I bought a case of K&N oil filters P/N- HP-2010
Mopar P/N- 4884899AB
There was a thread that linked to a review of many different oil filters and the Mopar is actually rated one of the best and for the value its a great buy. The K&N I like the hex on the bottom to use instead of a oil filter wrench, and its also a highly rated filter. Bought them online for 9.xx a piece.