I have actually been looking very seriously into mounting a 6 speed in my mk3 and so far I have found that a 02M will fit with custom trans mounts. There are 2 threads on Vortex that walk you through the process and I have them linked below. And I believe that a 4motion or R32 gearbox will fit so long as the rear output is blocked off. http://forums.vwvortex.com/zerothread?id=2633108 http://forums.vwvortex.com/zerothread?id=2037481