I just cut my Tank in half Today.There are 6 Holes total.2very small ones that are 3 3/8" & 4" off the Bottom,4 larger Holes starting at roughly 4 3/8" off the Bottom.Were there different Partitions for different Years?This seem like a Part that wouldn't change,as all the Tanks I've seen so far look alike.Disregarding the fact some have 2 Caps.