98 filler neck is different. I swapped my tank out for a BBRC tank and it required that I swap out my filler neck for one from an earlier car. There is a noticeable size difference between the one that was originally on my 98 and the one I pulled from a 96 car at the junk yard.
Also noticed that he started mounting the pump plate to the top as opposed to the front of the tank, looks better.
Can't believe you still have this. If it was the larger 18gallon tank I would have bought this already as I prefer the top mount pump as opposed to the way he did mine (I have one of the original designs.) Excellent tank and able to mount some seriously beefy pumps inside.