go to the tech section of this page read service bulletin #68-I-17 the first 68's had two lamp sockets using and extra brown wire to lite outer lamps the wire is pined in the M port of harness the bulletin says to remove wire and cut and tape back the lamps were very small twist lamp and the lens has a devider between the blubs.
I think it was some one's at GM idear about running lights\parking lights on all the time so pull your lens off and look at whats there and order the harness from a pontiac place!
