Looking to ID a few parts

I have a few parts in piles/boxes of Z stuff that I've started sorting through to determine what I want/need to keep and what will end up being made available for sale. Can anyone help ID the following items?

I think this may be a mass air flow from a 280ZX, it has a label on it that reads A31-627 420 and under that is JECS 2402 L28

I have a hose with a part attached to it, the hose has this Nissan part number on it: 27187 P8?70. I'd like to know what this is for so I can figure out what the small part it's attached to is.

I have a couple brackets that I think may be A/C mounts, the have this number cast in them: 11910 P8101

Thanx in advance everyone!!