Targa Catch Plate Covers

Can someone take a peek and see how the little black plastic covers on the underside of the targa catch plates behind the driver's and passenger's head are affixed? I know there is one screw about in the middle of the plastic cover but is there more than one?

 

Iain, thanks for taking that pic for me. Yours looks different than mine. My covers are pebble grained hard plastic. I have the center screw but two extra holes in the metal bodywork that looks like two more screws were used on the back flange.

 

Thanks again for your help. She's installed now but maybe I should trim the rear flange base a little.
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