I just picked up a UNI NU3230ST for my 03 YZ450 at the local shop and I just went to install it and noticed it doesnt have the rubber grommet that I remember being on my Uni filters for my 99-02 KX 250. Is this an old filter or does this model filter not have one? Regardless, should I stretch the foam around the centerstud on the cage or just let the bolt tighten up against the foam? I know its a stupid question, but I live in a sandy area so I dont want to risk anyything. Thanks in advance for any help.