The corrado tranny is an O2A, you need an 020. The 02A is a hydraulic clutch, so you would need to convert your gti to a hydraulic clutch set-up, or I am pretty sure someone sells a convert kit to make the 02A a cable operated clutch.
Edit- just thought I would add you can use any 4 cylinder VW tranny from 1977 through 1999. Thay are all 020.