There should be one silvery looking seal and one copper, both the same size, about 3/4 the size of a dime. The copper one is for the plug in the trans pan, the silvery (aluminum) one is for the drain plug in the torque converter.
The trans pan bolts are torqued to 8nm, the drain plugs are both 14 nm.
No idea what the large copper one is for.
Check out the trans pan gasket closely, it may be reuseable. Sometimes if over-torqued, they will "roll" towards the inside of the pan, you may be able to straighten in out and retorque the pan bolts and be OK.