Yun, looking in my 90's FSM I do believe that the bracket uses the two top bolts if I'm not mistaken? The bolt on top rear is an open backed hole so if that's the one you are concerned with it should be no problem to correct. In any event when I go clean my car tonight I will have a look so I can speak more positively. I do think that my earlier post is not accurate as to which bolt holes are blind and which are not. Senility still stinks!
Let me do a map quest on Annapolis as I have never been there. Hummmm, 9 hrs round trip....let me ponder this one.
Tom