I am not a mechanic but i am in the same situation with my G6 5 speed.. I have done dozens of hours research. You will find very few people do the conversion but plenty of conversion kits for sale.. What you need is a donor car or all the parts from a donor car. You need the tail shaft, you need engine/transmission looms the ECU, the zf transmission and the shifter setup from zf donor car. Will cost you $1500-$2000 for this kit from a recycled parts place. Its not a job for home and very hard to find someone to install it all.. I am having a hard time finding someone who can do the conversion in QLD.