Glad to know the fitting worked, Abbot!
Sorry another leak has surfaced.
Something you could
try on the leaking hole is a universal freeze plug sold in the help sections of auto parts stores. You may have to alter the size of the leaking hole to get one to fit, but that shouldn't be a problem.
Basically, these universal freeze plugs come in different sizes, and what they are is pretty much like the tank grommet I sent you except there's a bolt going through it. When tightened, the bolt causes the rubber freeze plug to expand and seal the hole it is put in. (Cheaper to try this than a buying a new tank. . .)
Hope this helps!