the filler hole for the transfer case is at the back of the transfer case on the left hand side of the car, a few inches above the bottom. The filler hole for the gear box is on the left hand side of the car as well, near the middle of the side of the gearbox, about half way up. They may be connected by a pipe.
Lane Toyota in Glen Waverley tried to sell me a Engine Sump Plug Gasket Washer for a 19mm Headed Sump Plug last Friday. The outer diameter of the Gasket Washer is the size that I have for the Sump Plug.