Thank youI would only carry blue airline and the appropriate bulkhead fitting which goes into the differential housing (if you have the early type, extra ferrules, small o-rings and the anti-crush sleeve). If you must, the rocker switch actuator/knob only or an entire rocker switch. They can be knocked off and break the pins.
I would not dig into the diff itself on the trail to change out wave springs or the seal housing o-rings). Rather drive it open to a proper repair facility, but while ordering parts also keep your own spares of the seal housing o rings so that the repairer does not need to order in.
Try ARB USA as supplier.