For the engine and transmission drain plug gaskets: Nissan P/N: 11026-01M02
For the transfer case and differential fill and drain plugs: Nissan P/N: 11026-4N200
I get the oil and trans pan drain plug gaskets in bulk from E-bay. Just search "nissan 11026-01M02" and you'll find them in bags of 5, 10, 20, 30, etc. and it's cheaper than getting them from the dealer in the long run.