drawson,
Call Dodge, Cummins and your favotrite parts store/mechanic see what they are asking for them. You should get 6 rubber gaskets and 6 O-rings.
I got mine from the service shop I took it to had trouble keeping them from leaking so I did them myself and made sure the bolts were torqued right (tightened enough), this stopped the vavle covers form leaking.