I am trying to remove the rear script "Riviera by Buick" emblem from the trunk of my Riviera. It doesn't have screws or nuts on the end.
Adam is correct. The emblem uses barrel nuts/retainers. The are a kind of compression fitting for the emblem studs. Place masking tape around the emblem and then use a small screw driver or putty knife to gently pry the emblem from the surface.