What I would do if you wanted to go through the Infiniti route, grab some of those part numbers, see if they can cross reference them to certain models and vehicle applications (with engine codes).
See if they have any in stock and look at the MAF itself, if it is very similar you should be able to grab it. The Z32 MAF has a 4 wire pin that looks like this below, and has a rough 85mm diameter. (I was able to score a brand new Z32 MAF from my friend).