Well I took my wing off and getting hole plugs to fill the holes seemed so simple when listening to everyone's description (two 3/8" and two 5/16" plugs). Well the back holes on mine aren't circular, they're more oval like two holes drilled right next to each other. Then the top right hole is 3/8" and the top left hole is 5/16". I don't know what I'm gonna do about the oval ones, I think I'm gonna try 1/2" plugs.