get back to your dinner....
looking at the lower photo that explains why i have the 15 to 20mm clearence at the bell housing as the pins of the reverse switch on my box are more or less beside the TT4 , as my box is slightly further (about 10mm) forward than yours i,m shortening the gear stick so it doesn,t get too close to the steering wheel.
its good to see how others have done the install
andy