Yes you do have to get to the screws if you are installing the fantastic fan ultra breeze covers. I did mine just yesterday. Get you some dicor lap seal. After you expose the screw heads and remove them. ...apply some dicor inside the screw hole. Take the new screws and screw down the brackets...The dicor you put inside the hole should 'ooze' up through the bracket, once that is done. ...apply dicor once again on top of the new screw. Use the dicor somewhat literally. The overall installation should not affect the overall seal.....hope this helps
'Pa Pa's Palace'
2014 Sportscoach Crosscountry 405FK
2015 Jeep Grand Cherokee Overland