I thought I would share one of my main sources for OEM Nissan parts.
First you need a couple parts books, this is the best one to get for the 60-series Patrol as it has the most up-to-date part numbers.
Now that book is not going to get you unobtainium parts like glass tail lights or 69 turn signal lights. What it does get you though is what is still OEM and available from Nissan. Not really going to get any NOS parts from Nissan these days. They dumped all their NOS stock years ago. Nissan still makes some stuff though and so the part numbers in the above book is what you need. The mico-finche from 1980 also is good and works but then you need a micro-finche viewer.
I use this book for P40 engine parts.
Obviously I also use that book for any parts I want or need for the 160-series Patrol.
You can buy the parts books on Ebay from time to time, keep an eye out often! Vary your searches on Ebay, knowing how to search online for Patrol parts is key to finding the parts.
Once you have the books and the good part numbers go here,
http://www.amayama.com/
Punch in part numbers and see what comes up. Some stuff that comes up you will not get but until you place the order you never know. Amayama takes your order, submits the order to their suppliers and then gets back to you on what is available before they charge you any money. Amayama supplies OEM parts from Japan and also UAE. Lastly, if a part comes up and you try to order it but it comes back not available. Try to order it again in a month or two. OEM parts are parts still in production so they often will come back available as new stock is made.
Good luck and cheers!