I have the same corrado selector in my valver, I took the std 16v one apart and replaced the stick with the corrado one, shortens the stick beautifully an feels more natural relaxed position as it comes to Hand easier, as for shortening the throw, I feel it made an improvement but I did t make measurements,
The reason I didn't cut mine was that I didn't hav the correct die for cutting the new thread and I wanted to retain the thread for my anni gear knob, and I had the rado one just gathering dust