Let me dig around this evening on my desktop...I visited the Omori Factory @ NISMO HQ in Japan last year and saw one of the Z Challenge 370Z's prepared by NISMO sitting in the garage. They had equipped the car with the prototype NISMO 370Z Diff Cooler and NISMO 370Z Oil Cooler. The Front fascia was on, but I think I got a few decent pictures of the fender liner and ducting.
Here is a link to the Omori Factory website covering the cooling system upgrades for the 350Z/370Z:
NISMO/Omori Factory Website
Based on the YEN conversion to USD, that oil cooler kit is actually MUCH MORE expensive than I thought previously. 210,000 YEN ~ $2,200 USD (rough calculation)