I'm going to change the fluid soon. Here's my understanding and summary of the tread (please correct if something is not correct).
Washers:
Rear Diff:
Drain: 12157-10010 (crush washer)
Fill: 12157-10010 (crush washer)
Front Diff:
Drain: 90430-24003 (flat copper washer)
Fill: 12157-10010 (crush washer)
Transfer Case:
Drain: 90430-A0003 (flat aluminum washers)
Fill: 90430-A0003 (flat aluminum washers)
Magnetic Plug Upgrade (Option 1): Budget
Rear Diff:
Drain: 90341-18035
Front Diff:
Drain: 90341-24016 (Optional nut head plug, if the old hex plug gets damaged)
Transfer Case:
Drain: Reuse the rear diff drain plug here or 90341-18021
Magnetic Plug Upgrade (Option 2): Magnets Everywhere!
Rear Diff:
Drain: 90341-18035
Fill: 90341-18021
Front Diff:
Drain: 90341-24016
Fill: 90341-18035
Transfer Case:
Drain: 90341-18021
Fill: 90341-18035
And finally for extra 48.5 hp: 
Brian's
@bjowett Billet Oil Cap for filter