I found this image looking for Expo 86 stuff. I thought this might have been an Special Edition of the Skylark, but I couldn't find any other image than this one.
So... Was there a special edition Skylark with those decals on the doors? Maybe only in Canada?
Original caption: "George Peapples; new president of GM Canada; leans on special edition Buick Skylark; emblazoned with Expo 86 emblem. He says the automaker faces over-capacity and adds that union co-operation could ensure there will be no job loss". Getty Images.