The normal MP breather grommet for that is P5007921.

Personally I like the OEM Mopar grommets a little better, which is (no P) 2946079. The only problem with the OE grommet is, it doesn't fit the hole in the valve cover very well....the hole needs to be opened up slightly. That, and the grommet has to be stretched a bit to go into the cast cover. But once they're in they aren't going to tear, leak, or move around for many years.