I was planning on changing the oil on my orphaned NC, and found this picture for the oil filter.
http://www.mazdastuff.com/custom/pro...1_14_302B2.gif
http://www.mazdastuff.com/product.cfm?ProductID=2168
So I take it Mazda/Ford went back to a non replaceable canister setup? I had that same set-up on my Triumph TR6.