I installed the BDCW kit. Had never removed tanks before, so it was an educational experience. The instructions recommend removing the left hand tank as well as right. I reckon you need to do that to get access - I also loosened the radiator to access the wiring.
Be careful to ensure the screw on the oil breather is replaced square to avoid stripping the thread like I did - had to helicoil it. On reflection, perhaps I should have slotted the fan tab slightly to take the slight pressure of the screw.. 20-20 hindsight!