I have the full set ; engine + wiring + Getrag 260/6 + relatively new clutch plate + long shaft + other bits of pieces.. Came out from my E34 535 approx 2 months ago. No pedals though.
Getrag 260/6 is the original gbox for 3.5 M30 engine. However, you can use other Getrag 260 series - but with minor modifications esp on the housing area. That will be cheaper to do - not to mention a 'softer' clutch pedal. U might need to change your rear diff to compensate the diff gear ratio that you are running.