Ordered everything I need from Z1 recently and am planning to put it all to use this weekend. I had planned on doing this a few months ago and stopped in the Nissan dealership to pick up the gaskets and of course all they had was 1 in stock - I bought it anyway. I also got 4 from Z1 - here's a pic of both of them together:
The Nissan dealer part looks more like what is on the drain plugs in pics that have been posted in this thread and the DIY Differential thread. Should I seek out 3 more of the OEM gaskets or is it safe to simply remove the old one and go with the copper style Z1 washers?