Breather Valves?

Going to get the underside of my 2020 Woolwax coated next week. Was thinking afterward would be a good time to replace the breathers on the trasfer case and front and rear diffs. On Sparks Parts I see the digram for the front and rear diff but I don't see them showing part numbers for these breather. Anyone know something about these?

 

Why do you think you need to replace them on a relatively new truck? You can always pull them off to give them a cleaning if you're concerned about it, also it might be a good idea to cover them with something before you get the undercoating sprayed.

 

Might want to relocate your rear diff breather in the left taillight housing.

 

Probably only rear diff needs to be pulled up to behind the DS tail light. Arb has a kit or you can DIY.