Do what I did and talk to your nearest Nissan Dealer, they told me who fitted them for them in Canberra. Mine is fly by wire, cost me 500 about 3 years ago. It fits in the steering wheel itself, looks like factory fit and is briliant. I have a 02 ZD30 Manual Series 3. I can have a look and see if I can find a makers mark on it. As everything is packed for the removal, I wont be able to find the reciept at the moment.
Am pretty sure, this was the mob that fitted it for me.
Just Batteries
(02) 62533000