the clutches in an automatic transmission are inside the transmission assembled in packs, a total of 4 packs and about a total of (if I recall correctly) 16 clutch friction plates.
the manual single friction plate on the flywheel is not going to be used in the auto.
To convert a newer manual corolla to auto you would need to buy
1 - ECU + wiring (yes wiring too - because the transmission is electric shift and the ECU controls its shifting)
2 - Transmission + torque converter + flex plate + complete axle shafts
3 - Engine mount for transmission
4 - Radiator with transmission cooler
5 - Shifter assembly
6 - Pedal assembly for automatic
7 - Shift select cable for selector
8 - 8 or 10 litres of toyota ATF.
Once you have the above - you can then get to swapping the manual to automatic, It would also require a mechanic/technician who actually knows what he's looking at. Its not a simple job that you can just go to any shop and request. Whoever undertakes this job will not be cheap either as the toyo electric shift gearbox with partial lockup torque converter is slightly a PITA to work out.