The diff was designed for the early model 350z. You will need the stub axles from that particular model. From the models with the open diff. The nissan part number is 38220-JK01B. You also need the ABS trigger wheel from the early model 350z.
The diff should just go right in. OS Giken does recommend the finned cover or an aftermarket cooler hooked up due to lack of airflow over the rear diff cover.
Sending you a message with some more info!
Thanks,
Alex Goodwin
AlexG@motionlabtuning.com