You may have to drill the heads of the screws then after removing the cover back the rest of the screw out with some vice grips. Of course you would have to get new screws for reassembly. You may have luck with an easy out too. Take a look at the link below.I am trying to remove the plugs on my '10 LX Rio but the couple screws that hold down the plastic cover are stripped and the space isnt big enough to fit a socket down. Any ideas??