Neither of those are from a Harrier mask, indeed the top one is the other end. Its the connector from the top of a Personal equipment connector (PEC) which connects the mask to the seat.
The lower one is more like a V bomber connector. I'm sure the Ancient Squipper will be along to confirm soon enough. We used them at Farnborough but I can't honestly recall what for. In the hypobaric chamber I'd guess.