I have about ten here at the house that are original Nissan part #16404-68225. The box includes the filter and a spring, but no gaskets. I got these in the last few years from Nissanparts.cc, which is Nissan of Olympia, WA. So you may still be able to order them.
Cool! Thanks for the info! Nissanparts.cc is actually local to me and I work for Titus-Will Toyota who is related to Nissanparts.cc (Bruce-Titus Nissan in Olympia, WA.) So I can probably get a discount!
Merry Christmas to all!