the old filter is is a little shorter by 1/8 inch, maybe a touch less.
which explains why when I remove the grommet the cap screws in fine.
the other thing I just notice is that the old filter did not click into the finger on the cap but actually
set farther into the cap. The new filter clips into the fingers and I loose about an 1/8 because of it.
I had this same problem bought my filter's from Geno's, then when they went to the ""user friendly filters" they were as you say about 1/8" too tall and I couldn't screw the top on, even with my 275 lbs pushing on it all it would do is distort the filter. I finally found a local supplier that got me the old style and haven't had an issue since.