This thread is a few weeks old, just spotted it, I would love to have a 6 speed box in my 1.4 Sport and when I had the 160 SR I thought it was crying out for a 6 speed. Regarding the diesel K9K engine you have which was also fitted to the MK2 and 3 Clio's so if any of those had a 6 speed box then that may be possible without too much drama.