Corrado one is too fat i think, its not as Flat as the mk3 one, so i dont think it would fit in the hangers, its also heavier. They cost about 50% more than a mk3 16v rear box.
If ur looking for a mk3 gti 16v standard rear box... euro parts have them for £59, but ive been quoted £50 fitted from some national garages like F1 autocentres/ britannia etc.