Ill go out to garage and look.... hold on....
EDIT:
OK,
along the edges of the chrome itself, of the lights (part closest to the Trunk) it is painted a flat black.
imagine the lens and then a 1/2 inch chrome trim ring directly around them.... ok?
now the rest of the chrome that reaches closer and closer to the rear sheetmetal, is painted in a flat black.
on my car, the tops, bottoms and sides are painted black (again except that chrome "trim ring effect" thats 1/2 inch around and closest to the plastic lenses)