Thought it might help narrow it down if you looked on the MAF for the number that is in that thread. That's how I found out mine's the 70mm, since it isn't certain for a '91. If yours has that number, there you go. Just a thought, that someone may have swapped it for a later model MAF rather than aftermarket, if they swapped it out. Or, post what you see on yours, maybe someone will recognize it?