Finally decided to do all myself..
So I got a complete M3 DCT subframe + diff + complete drive shaft
And now how to adapt the M3 DCT drive shaft to the 335i 6MT gearbox?
The M3 is 1"shorter, and the holes are in a bigger circle, so finally I ended up to build an adapter plate 1" thick to match the gap...
Will see in spring when I will put all together.