I did a B5 chassis, assuming its much the same, you will need the gear linkage, driveshafts for the 6 speed as they are 130mm flanged units,you may then need to change the hubs as the hub flanges could be different (they were on the B5).
Also the subframe or gearbox mount will need moddifying to suit as the 6 speeders have the donut mount on both sides