BTW, from the photo, the grommet looks fine, just dirty. Those grommets are supposed to have the slit in them from the factory.
I remembered another thing about the black cover - I think it is hinged at the rear with one half of the flange under the metal bracket and the other half that snaps onto the metal as a decorative cover. So be careful not to rip the hinge. Is your garage heated? You could also use a heat gun to warm up the plastic before you pry. That way it won't crack.
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